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/config.go

@@ -0,0 +1,45 @@
+package initialise
+
+import (
+	"github.com/spf13/viper"
+	"github.com/zitadel/logging"
+
+	"github.com/zitadel/zitadel/internal/database"
+	"github.com/zitadel/zitadel/internal/id"
+)
+
+type Config struct {
+	Database  database.Config
+	AdminUser database.User
+	Machine   *id.Config
+	Log       *logging.Config
+}
+
+func MustNewConfig(v *viper.Viper) *Config {
+	config := new(Config)
+	err := v.Unmarshal(config)
+	logging.OnError(err).Fatal("unable to read config")
+
+	err = config.Log.SetLogger()
+	logging.OnError(err).Fatal("unable to set logger")
+
+	return config
+}
+
+func adminConfig(config *Config) database.Config {
+	adminConfig := config.Database
+	adminConfig.Username = config.AdminUser.Username
+	adminConfig.Password = config.AdminUser.Password
+	adminConfig.SSL.Cert = config.AdminUser.SSL.Cert
+	adminConfig.SSL.Key = config.AdminUser.SSL.Key
+	if config.AdminUser.SSL.RootCert != "" {
+		adminConfig.SSL.RootCert = config.AdminUser.SSL.RootCert
+	}
+	if config.AdminUser.SSL.Mode != "" {
+		adminConfig.SSL.Mode = config.AdminUser.SSL.Mode
+	}
+	//use default database because the zitadel database might not exist
+	adminConfig.Database = ""
+
+	return adminConfig
+}