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/initialise/verify_user.go

@@ -0,0 +1,50 @@
+package initialise
+
+import (
+	"database/sql"
+	_ "embed"
+	"fmt"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+	"github.com/zitadel/logging"
+)
+
+var (
+	searchUser = "SELECT username FROM [show roles] WHERE username = $1"
+	//go:embed sql/01_user.sql
+	createUserStmt string
+)
+
+func newUser() *cobra.Command {
+	return &cobra.Command{
+		Use:   "user",
+		Short: "initialize only the database user",
+		Long: `Sets up the ZITADEL database user.
+
+Prereqesits:
+- cockroachdb
+
+The user provided by flags needs priviledge to 
+- create the database if it does not exist
+- see other users and create a new one if the user does not exist
+- grant all rights of the ZITADEL database to the user created if not yet set
+`,
+		Run: func(cmd *cobra.Command, args []string) {
+			config := MustNewConfig(viper.New())
+
+			err := initialise(config, VerifyUser(config.Database.Username, config.Database.Password))
+			logging.OnError(err).Fatal("unable to init user")
+		},
+	}
+}
+
+func VerifyUser(username, password string) func(*sql.DB) error {
+	return func(db *sql.DB) error {
+		logging.WithFields("username", username).Info("verify user")
+		return verify(db,
+			exists(searchUser, username),
+			exec(fmt.Sprintf(createUserStmt, username), &sql.NullString{String: password, Valid: password != ""}),
+		)
+	}
+}