runservice: add CacheGroup field to runconfig

The cache group fields defines under which cache group the run cache data will
belong. This is needed/useful for some next changes:

* Make cache correctly work for user direct runs. Since the user direct runs all
belong to the same run group (the user id) all the use direct runs will share the
same caches. To distinguish between the different caches we need to use something
in addition to the user id (the local repo uuid generated by the direct run
start command)
* Share the cache between multiple projects

internal/services/runservice/action/action.go

@@ -135,6 +135,7 @@ type RunCreateRequest struct {
 	Group             string
 	SetupErrors       []string
 	StaticEnvironment map[string]string
+	CacheGroup        string
 
 	// existing run fields
 	RunID      string
@@ -210,6 +211,7 @@ func (h *ActionHandler) newRun(ctx context.Context, req *RunCreateRequest) (*typ
 		StaticEnvironment: req.StaticEnvironment,
 		Environment:       req.Environment,
 		Annotations:       req.Annotations,
+		CacheGroup:        req.CacheGroup,
 	}
 
 	run := genRun(rc)

internal/services/runservice/api/api.go

@@ -515,6 +515,7 @@ type RunCreateRequest struct {
 	Group             string                          `json:"group"`
 	SetupErrors       []string                        `json:"setup_errors"`
 	StaticEnvironment map[string]string               `json:"static_environment"`
+	CacheGroup        string                          `json:"cache_group"`
 
 	// existing run fields
 	RunID      string   `json:"run_id"`
@@ -556,6 +557,7 @@ func (h *RunCreateHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		Group:             req.Group,
 		SetupErrors:       req.SetupErrors,
 		StaticEnvironment: req.StaticEnvironment,
+		CacheGroup:        req.CacheGroup,
 
 		RunID:      req.RunID,
 		FromStart:  req.FromStart,

internal/services/runservice/scheduler.go

@@ -335,6 +335,11 @@ func (s *Runservice) genExecutorTask(ctx context.Context, r *types.Run, rt *type
 	// run config Environment variables ovverride every other environment variable
 	mergeEnv(environment, rc.Environment)
 
+	cachePrefix := store.OSTRootGroup(r.Group)
+	if rc.CacheGroup != "" {
+		cachePrefix = rc.CacheGroup
+	}
+
 	et := &types.ExecutorTask{
 		// The executorTask ID must be the same as the runTask ID so we can detect if
 		// there's already an executorTask scheduled for that run task and we can get
@@ -349,7 +354,7 @@ func (s *Runservice) genExecutorTask(ctx context.Context, r *types.Run, rt *type
 		Shell:       rct.Shell,
 		User:        rct.User,
 		Steps:       rct.Steps,
-		CachePrefix: store.OSTRootGroup(r.Group),
+		CachePrefix: cachePrefix,
 		Status: types.ExecutorTaskStatus{
 			Phase:      types.ExecutorTaskPhaseNotStarted,
 			Steps:      make([]*types.ExecutorTaskStepStatus, len(rct.Steps)),

internal/services/runservice/types/types.go

@@ -306,6 +306,9 @@ type RunConfig struct {
 	Environment map[string]string `json:"environment,omitempty"`
 
 	Tasks map[string]*RunConfigTask `json:"tasks,omitempty"`
+
+	// CacheGroup is the cache group where the run caches belongs
+	CacheGroup string `json:"cache_group,omitempty"`
 }
 
 func (rc *RunConfig) DeepCopy() *RunConfig {