perf: speed up action downloads (#1209)

An action pinned to a full commit hash cloned the whole repository, and a cached one hit the network on every run. Now only the pinned commit is fetched at depth 1, a cached commit is reused with no network at all, and the action's `.git` directory no longer ships into the job container, matching GitHub.

```
repo                  cold ms         warm ms       cache KiB
actions/checkout      5807 → 787    1064 → 12    11492 → 2349
actions/setup-node   15257 → 1013   1365 → 21    64303 → 9924
actions/cache        18782 → 760    1589 → 16    60890 → 12507
actions/setup-go      5513 → 764     589 → 20    16600 → 9104
docker/login-action  25809 → 1225   1288 → 10    81709 → 12503
```

Reviewed-on: https://gitea.com/gitea/runner/pulls/1209
Reviewed-by: bircni <bircni@icloud.com>
Co-authored-by: silverwind <me@silverwind.io>

act/runner/action.go

@@ -154,7 +154,7 @@ func maybeCopyToActionDir(ctx context.Context, step actionStep, actionDir, actio
 		return err
 	}
 
-	return rc.JobContainer.CopyDir(containerActionDirCopy, actionDir+"/", rc.Config.UseGitIgnore)(ctx)
+	return rc.JobContainer.CopyDir(containerActionDirCopy, actionDir+"/", rc.Config.UseGitIgnore, true)(ctx)
 }
 
 func runActionImpl(step actionStep, actionDir string, remoteAction *remoteAction) common.Executor {

act/runner/action_test.go

@@ -227,7 +227,7 @@ func TestActionRunner(t *testing.T) {
 			ctx := context.Background()
 
 			cm := &containerMock{}
-			cm.On("CopyDir", "/var/run/act/actions/dir/", "dir/", false).Return(func(ctx context.Context) error { return nil })
+			cm.On("CopyDir", "/var/run/act/actions/dir/", "dir/", false, true).Return(func(ctx context.Context) error { return nil })
 
 			envMatcher := mock.MatchedBy(func(env map[string]string) bool {
 				for k, v := range tt.expectedEnv {
@@ -337,7 +337,7 @@ func TestMaybeCopyToActionDirHoldsCloneLock(t *testing.T) {
 	copyEntered := make(chan struct{})
 
 	cm := &containerMock{}
-	cm.On("CopyDir", "/var/run/act/actions/", actionDir+"/", false).Return(func(ctx context.Context) error {
+	cm.On("CopyDir", "/var/run/act/actions/", actionDir+"/", false, true).Return(func(ctx context.Context) error {
 		close(copyEntered)
 		<-releaseCopy
 		return nil

act/runner/container_mock_test.go

@@ -57,8 +57,8 @@ func (cm *containerMock) Copy(destPath string, files ...*container.FileEntry) co
 	return args.Get(0).(func(context.Context) error)
 }
 
-func (cm *containerMock) CopyDir(destPath, srcPath string, useGitIgnore bool) common.Executor {
-	args := cm.Called(destPath, srcPath, useGitIgnore)
+func (cm *containerMock) CopyDir(destPath, srcPath string, useGitIgnore, skipGitDir bool) common.Executor {
+	args := cm.Called(destPath, srcPath, useGitIgnore, skipGitDir)
 	return args.Get(0).(func(context.Context) error)
 }
 

act/runner/patch_actions_test.go

@@ -244,7 +244,7 @@ func TestPatchActionsAtTheContainerCopy(t *testing.T) {
 		require.NoError(t, os.WriteFile(script, []byte(gateTSC), 0o600))
 
 		var copied string
-		cm.On("CopyDir", mock.Anything, mock.Anything, mock.Anything).Return(func(context.Context) error {
+		cm.On("CopyDir", mock.Anything, mock.Anything, mock.Anything, mock.Anything).Return(func(context.Context) error {
 			body, err := os.ReadFile(script)
 			require.NoError(t, err)
 			copied = string(body)

act/runner/step_action_remote.go

@@ -169,7 +169,7 @@ func (sar *stepActionRemote) main() common.Executor {
 					return fmt.Errorf("unable to interpolate with.path: %w", err)
 				}
 				copyToPath := path.Join(sar.RunContext.JobContainer.ToContainerPath(sar.RunContext.Config.Workdir), checkoutPath)
-				return sar.RunContext.JobContainer.CopyDir(copyToPath, sar.RunContext.Config.Workdir+string(filepath.Separator)+".", sar.RunContext.Config.UseGitIgnore)(ctx)
+				return sar.RunContext.JobContainer.CopyDir(copyToPath, sar.RunContext.Config.Workdir+string(filepath.Separator)+".", sar.RunContext.Config.UseGitIgnore, false)(ctx)
 			}
 
 			return sar.runAction(sar, sar.actionDir(), sar.remoteAction)(ctx)