chore(tests): use a coverage server binary (#8407)

# Which Problems Are Solved

Use a single server instance for API integration tests. This optimizes
the time taken for the integration test pipeline,
because it allows running tests on multiple packages in parallel. Also,
it saves time by not start and stopping a zitadel server for every
package.

# How the Problems Are Solved

- Build a binary with `go build -race -cover ....`
- Integration tests only construct clients. The server remains running
in the background.
- The integration package and tested packages now fully utilize the API.
No more direct database access trough `query` and `command` packages.
- Use Makefile recipes to setup, start and stop the server in the
background.
- The binary has the race detector enabled
- Init and setup jobs are configured to halt immediately on race
condition
- Because the server runs in the background, races are only logged. When
the server is stopped and race logs exist, the Makefile recipe will
throw an error and print the logs.
- Makefile recipes include logic to print logs and convert coverage
reports after the server is stopped.
- Some tests need a downstream HTTP server to make requests, like quota
and milestones. A new `integration/sink` package creates an HTTP server
and uses websockets to forward HTTP request back to the test packages.
The package API uses Go channels for abstraction and easy usage.

# Additional Changes

- Integration test files already used the `//go:build integration`
directive. In order to properly split integration from unit tests,
integration test files need to be in a `integration_test` subdirectory
of their package.
- `UseIsolatedInstance` used to overwrite the `Tester.Client` for each
instance. Now a `Instance` object is returned with a gRPC client that is
connected to the isolated instance's hostname.
- The `Tester` type is now `Instance`. The object is created for the
first instance, used by default in any test. Isolated instances are also
`Instance` objects and therefore benefit from the same methods and
values. The first instance and any other us capable of creating an
isolated instance over the system API.
- All test packages run in an Isolated instance by calling
`NewInstance()`
- Individual tests that use an isolated instance use `t.Parallel()`

# Additional Context

- Closes #6684
- https://go.dev/doc/articles/race_detector
- https://go.dev/doc/build-cover

---------

Co-authored-by: Stefan Benz <46600784+stebenz@users.noreply.github.com>

internal/api/grpc/resources/webkey/v3/integration_test/webkey_integration_test.go

@@ -0,0 +1,245 @@
+//go:build integration
+
+package webkey_test
+
+import (
+	"context"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/types/known/timestamppb"
+
+	"github.com/zitadel/zitadel/internal/integration"
+	"github.com/zitadel/zitadel/pkg/grpc/feature/v2"
+	object "github.com/zitadel/zitadel/pkg/grpc/object/v3alpha"
+	resource_object "github.com/zitadel/zitadel/pkg/grpc/resources/object/v3alpha"
+	webkey "github.com/zitadel/zitadel/pkg/grpc/resources/webkey/v3alpha"
+)
+
+var (
+	CTX context.Context
+)
+
+func TestMain(m *testing.M) {
+	os.Exit(func() int {
+		ctx, cancel := context.WithTimeout(context.Background(), 15*time.Minute)
+		defer cancel()
+		CTX = ctx
+		return m.Run()
+	}())
+}
+
+func TestServer_Feature_Disabled(t *testing.T) {
+	instance, iamCtx := createInstance(t, false)
+	client := instance.Client.WebKeyV3Alpha
+
+	t.Run("CreateWebKey", func(t *testing.T) {
+		_, err := client.CreateWebKey(iamCtx, &webkey.CreateWebKeyRequest{})
+		assertFeatureDisabledError(t, err)
+	})
+	t.Run("ActivateWebKey", func(t *testing.T) {
+		_, err := client.ActivateWebKey(iamCtx, &webkey.ActivateWebKeyRequest{
+			Id: "1",
+		})
+		assertFeatureDisabledError(t, err)
+	})
+	t.Run("DeleteWebKey", func(t *testing.T) {
+		_, err := client.DeleteWebKey(iamCtx, &webkey.DeleteWebKeyRequest{
+			Id: "1",
+		})
+		assertFeatureDisabledError(t, err)
+	})
+	t.Run("ListWebKeys", func(t *testing.T) {
+		_, err := client.ListWebKeys(iamCtx, &webkey.ListWebKeysRequest{})
+		assertFeatureDisabledError(t, err)
+	})
+}
+
+func TestServer_ListWebKeys(t *testing.T) {
+	instance, iamCtx := createInstance(t, true)
+	// After the feature is first enabled, we can expect 2 generated keys with the default config.
+	checkWebKeyListState(iamCtx, t, instance, 2, "", &webkey.WebKey_Rsa{
+		Rsa: &webkey.WebKeyRSAConfig{
+			Bits:   webkey.WebKeyRSAConfig_RSA_BITS_2048,
+			Hasher: webkey.WebKeyRSAConfig_RSA_HASHER_SHA256,
+		},
+	})
+}
+
+func TestServer_CreateWebKey(t *testing.T) {
+	instance, iamCtx := createInstance(t, true)
+	client := instance.Client.WebKeyV3Alpha
+
+	_, err := client.CreateWebKey(iamCtx, &webkey.CreateWebKeyRequest{
+		Key: &webkey.WebKey{
+			Config: &webkey.WebKey_Rsa{
+				Rsa: &webkey.WebKeyRSAConfig{
+					Bits:   webkey.WebKeyRSAConfig_RSA_BITS_2048,
+					Hasher: webkey.WebKeyRSAConfig_RSA_HASHER_SHA256,
+				},
+			},
+		},
+	})
+	require.NoError(t, err)
+
+	checkWebKeyListState(iamCtx, t, instance, 3, "", &webkey.WebKey_Rsa{
+		Rsa: &webkey.WebKeyRSAConfig{
+			Bits:   webkey.WebKeyRSAConfig_RSA_BITS_2048,
+			Hasher: webkey.WebKeyRSAConfig_RSA_HASHER_SHA256,
+		},
+	})
+}
+
+func TestServer_ActivateWebKey(t *testing.T) {
+	instance, iamCtx := createInstance(t, true)
+	client := instance.Client.WebKeyV3Alpha
+
+	resp, err := client.CreateWebKey(iamCtx, &webkey.CreateWebKeyRequest{
+		Key: &webkey.WebKey{
+			Config: &webkey.WebKey_Rsa{
+				Rsa: &webkey.WebKeyRSAConfig{
+					Bits:   webkey.WebKeyRSAConfig_RSA_BITS_2048,
+					Hasher: webkey.WebKeyRSAConfig_RSA_HASHER_SHA256,
+				},
+			},
+		},
+	})
+	require.NoError(t, err)
+
+	_, err = client.ActivateWebKey(iamCtx, &webkey.ActivateWebKeyRequest{
+		Id: resp.GetDetails().GetId(),
+	})
+	require.NoError(t, err)
+
+	checkWebKeyListState(iamCtx, t, instance, 3, resp.GetDetails().GetId(), &webkey.WebKey_Rsa{
+		Rsa: &webkey.WebKeyRSAConfig{
+			Bits:   webkey.WebKeyRSAConfig_RSA_BITS_2048,
+			Hasher: webkey.WebKeyRSAConfig_RSA_HASHER_SHA256,
+		},
+	})
+}
+
+func TestServer_DeleteWebKey(t *testing.T) {
+	instance, iamCtx := createInstance(t, true)
+	client := instance.Client.WebKeyV3Alpha
+
+	keyIDs := make([]string, 2)
+	for i := 0; i < 2; i++ {
+		resp, err := client.CreateWebKey(iamCtx, &webkey.CreateWebKeyRequest{
+			Key: &webkey.WebKey{
+				Config: &webkey.WebKey_Rsa{
+					Rsa: &webkey.WebKeyRSAConfig{
+						Bits:   webkey.WebKeyRSAConfig_RSA_BITS_2048,
+						Hasher: webkey.WebKeyRSAConfig_RSA_HASHER_SHA256,
+					},
+				},
+			},
+		})
+		require.NoError(t, err)
+		keyIDs[i] = resp.GetDetails().GetId()
+	}
+	_, err := client.ActivateWebKey(iamCtx, &webkey.ActivateWebKeyRequest{
+		Id: keyIDs[0],
+	})
+	require.NoError(t, err)
+
+	ok := t.Run("cannot delete active key", func(t *testing.T) {
+		_, err := client.DeleteWebKey(iamCtx, &webkey.DeleteWebKeyRequest{
+			Id: keyIDs[0],
+		})
+		require.Error(t, err)
+		s := status.Convert(err)
+		assert.Equal(t, codes.FailedPrecondition, s.Code())
+		assert.Contains(t, s.Message(), "COMMAND-Chai1")
+	})
+	if !ok {
+		return
+	}
+
+	ok = t.Run("delete inactive key", func(t *testing.T) {
+		_, err := client.DeleteWebKey(iamCtx, &webkey.DeleteWebKeyRequest{
+			Id: keyIDs[1],
+		})
+		require.NoError(t, err)
+	})
+	if !ok {
+		return
+	}
+
+	// There are 2 keys from feature setup, +2 created, -1 deleted = 3
+	checkWebKeyListState(iamCtx, t, instance, 3, keyIDs[0], &webkey.WebKey_Rsa{
+		Rsa: &webkey.WebKeyRSAConfig{
+			Bits:   webkey.WebKeyRSAConfig_RSA_BITS_2048,
+			Hasher: webkey.WebKeyRSAConfig_RSA_HASHER_SHA256,
+		},
+	})
+}
+
+func createInstance(t *testing.T, enableFeature bool) (*integration.Instance, context.Context) {
+	instance := integration.NewInstance(CTX)
+	iamCTX := instance.WithAuthorization(CTX, integration.UserTypeIAMOwner)
+
+	if enableFeature {
+		_, err := instance.Client.FeatureV2.SetInstanceFeatures(iamCTX, &feature.SetInstanceFeaturesRequest{
+			WebKey: proto.Bool(true),
+		})
+		require.NoError(t, err)
+	}
+	assert.EventuallyWithT(t, func(ttt *assert.CollectT) {
+		resp, err := instance.Client.WebKeyV3Alpha.ListWebKeys(iamCTX, &webkey.ListWebKeysRequest{})
+		if enableFeature {
+			assert.NoError(ttt, err)
+			assert.Len(t, resp.GetWebKeys(), 2)
+		} else {
+			assert.Error(t, err)
+		}
+	}, time.Minute, time.Second)
+
+	return instance, iamCTX
+}
+
+func assertFeatureDisabledError(t *testing.T, err error) {
+	t.Helper()
+	require.Error(t, err)
+	s := status.Convert(err)
+	assert.Equal(t, codes.FailedPrecondition, s.Code())
+	assert.Contains(t, s.Message(), "WEBKEY-Ohx6E")
+}
+
+func checkWebKeyListState(ctx context.Context, t *testing.T, instance *integration.Instance, nKeys int, expectActiveKeyID string, config any) {
+	resp, err := instance.Client.WebKeyV3Alpha.ListWebKeys(ctx, &webkey.ListWebKeysRequest{})
+	require.NoError(t, err)
+	list := resp.GetWebKeys()
+	require.Len(t, list, nKeys)
+
+	now := time.Now()
+	var gotActiveKeyID string
+	for _, key := range list {
+		integration.AssertResourceDetails(t, &resource_object.Details{
+			Created: timestamppb.Now(),
+			Changed: timestamppb.Now(),
+			Owner: &object.Owner{
+				Type: object.OwnerType_OWNER_TYPE_INSTANCE,
+				Id:   instance.ID(),
+			},
+		}, key.GetDetails())
+		assert.WithinRange(t, key.GetDetails().GetChanged().AsTime(), now.Add(-time.Minute), now.Add(time.Minute))
+		assert.NotEqual(t, webkey.WebKeyState_STATE_UNSPECIFIED, key.GetState())
+		assert.NotEqual(t, webkey.WebKeyState_STATE_REMOVED, key.GetState())
+		assert.Equal(t, config, key.GetConfig().GetConfig())
+
+		if key.GetState() == webkey.WebKeyState_STATE_ACTIVE {
+			gotActiveKeyID = key.GetDetails().GetId()
+		}
+	}
+	assert.NotEmpty(t, gotActiveKeyID)
+	if expectActiveKeyID != "" {
+		assert.Equal(t, expectActiveKeyID, gotActiveKeyID)
+	}
+}