fix: enable env vars in setup steps (and deprecate admin subcommand) (#3871)

* fix: enable env vars in setup steps (and deprecate admin subcommand)

* fix tests and error text

cmd/setup/config.go

@@ -0,0 +1,85 @@
+package setup
+
+import (
+	"bytes"
+	"strings"
+
+	"github.com/mitchellh/mapstructure"
+	"github.com/spf13/viper"
+	"github.com/zitadel/logging"
+
+	"github.com/zitadel/zitadel/internal/api/authz"
+	"github.com/zitadel/zitadel/internal/command"
+	"github.com/zitadel/zitadel/internal/config/hook"
+	"github.com/zitadel/zitadel/internal/config/systemdefaults"
+	"github.com/zitadel/zitadel/internal/crypto"
+	"github.com/zitadel/zitadel/internal/database"
+)
+
+type Config struct {
+	Database        database.Config
+	SystemDefaults  systemdefaults.SystemDefaults
+	InternalAuthZ   authz.Config
+	ExternalDomain  string
+	ExternalPort    uint16
+	ExternalSecure  bool
+	Log             *logging.Config
+	EncryptionKeys  *encryptionKeyConfig
+	DefaultInstance command.InstanceSetup
+}
+
+func MustNewConfig(v *viper.Viper) *Config {
+	config := new(Config)
+	err := v.Unmarshal(config,
+		viper.DecodeHook(mapstructure.ComposeDecodeHookFunc(
+			hook.Base64ToBytesHookFunc(),
+			hook.TagToLanguageHookFunc(),
+			mapstructure.StringToTimeDurationHookFunc(),
+			mapstructure.StringToSliceHookFunc(","),
+		)),
+	)
+	logging.OnError(err).Fatal("unable to read default config")
+
+	err = config.Log.SetLogger()
+	logging.OnError(err).Fatal("unable to set logger")
+
+	return config
+}
+
+type Steps struct {
+	s1ProjectionTable *ProjectionTable
+	s2AssetsTable     *AssetTable
+	S3DefaultInstance *DefaultInstance
+}
+
+type encryptionKeyConfig struct {
+	User *crypto.KeyConfig
+	SMTP *crypto.KeyConfig
+}
+
+func MustNewSteps(v *viper.Viper) *Steps {
+	v.AutomaticEnv()
+	v.SetEnvPrefix("ZITADEL")
+	v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+	v.SetConfigType("yaml")
+	err := v.ReadConfig(bytes.NewBuffer(defaultSteps))
+	logging.OnError(err).Fatal("unable to read setup steps")
+
+	for _, file := range stepFiles {
+		v.SetConfigFile(file)
+		err := v.MergeInConfig()
+		logging.WithFields("file", file).OnError(err).Warn("unable to read setup file")
+	}
+
+	steps := new(Steps)
+	err = v.Unmarshal(steps,
+		viper.DecodeHook(mapstructure.ComposeDecodeHookFunc(
+			hook.Base64ToBytesHookFunc(),
+			hook.TagToLanguageHookFunc(),
+			mapstructure.StringToTimeDurationHookFunc(),
+			mapstructure.StringToSliceHookFunc(","),
+		)),
+	)
+	logging.OnError(err).Fatal("unable to read steps")
+	return steps
+}