Add option in database config to skip migrations for faster startup. (#30146)

Signed-off-by: Tom Wilkie <tom.wilkie@gmail.com>

pkg/services/sqlstore/sqlstore.go

@@ -87,6 +87,7 @@ func (ss *SQLStore) Init() error {
 	x = ss.engine
 	dialect = ss.Dialect
 
+	if !ss.dbCfg.SkipMigrations {
 		migrator := migrator.NewMigrator(ss.engine)
 		migrations.AddMigrations(migrator)
 
@@ -100,6 +101,7 @@ func (ss *SQLStore) Init() error {
 		if err := migrator.Start(); err != nil {
 			return err
 		}
+	}
 
 	// Init repo instances
 	annotations.SetRepository(&SQLAnnotationRepo{})
@@ -388,6 +390,7 @@ func (ss *SQLStore) readConfig() {
 	ss.dbCfg.Path = sec.Key("path").MustString("data/grafana.db")
 
 	ss.dbCfg.CacheMode = sec.Key("cache_mode").MustString("private")
+	ss.dbCfg.SkipMigrations = sec.Key("skip_migrations").MustBool()
 }
 
 // ITestDB is an interface of arguments for testing db
@@ -525,4 +528,5 @@ type DatabaseConfig struct {
 	ConnMaxLifetime  int
 	CacheMode        string
 	UrlQueryParams   map[string][]string
+	SkipMigrations   bool
 }