[installer] Add disableDefinitelyGp config option

/werft no-preview

Author: corneliusludmann

components/installer/pkg/components/server/configmap.go

@@ -45,7 +45,7 @@ func configmap(ctx *common.RenderContext) ([]runtime.Object, error) {
 			MaxAgeMs: 259200000,
 			Secret:   "Important!Really-Change-This-Key!", // todo(sje): how best to do this?
 		},
-		DefinitelyGpDisabled: false,
+		DefinitelyGpDisabled: ctx.Config.DisableDefinitelyGP,
 		WorkspaceGarbageCollection: WorkspaceGarbageCollection{
 			ChunkLimit:                 1000,
 			ContentChunkLimit:          1000,

components/installer/pkg/config/v1/config.go

@@ -88,6 +88,8 @@ type Config struct {
 
 	SSHGatewayHostKey *ObjectRef `json:"sshGatewayHostKey,omitempty"`
 
+	DisableDefinitelyGP bool `json:"disableDefinitelyGp,omitempty"`
+
 	Experimental *experimental.Config `json:"experimental,omitempty"`
 }