fix: log schema validation errors from actions

Resolves forgejo/runner#809

act/runner/action.go

@@ -45,7 +45,7 @@ func readActionImpl(ctx context.Context, step *model.Step, actionDir, actionPath
 	allErrors := []error{}
 	addError := func(fileName string, err error) {
 		if err != nil {
-			allErrors = append(allErrors, fmt.Errorf("failed to read '%s' from action '%s' with path '%s' of step %w", fileName, step.String(), actionPath, err))
+			allErrors = append(allErrors, fmt.Errorf("failed to read '%s' from action '%s' with path '%s': %w", fileName, step.String(), actionPath, err))
 		} else {
 			// One successful read, clear error state
 			allErrors = nil
@@ -112,6 +112,9 @@ func readActionImpl(ctx context.Context, step *model.Step, actionDir, actionPath
 	defer closer.Close()
 
 	action, err := model.ReadAction(reader)
+	if err != nil {
+		err = fmt.Errorf("failed to validate action.y*ml from action '%s' with path '%s': %v", step.String(), actionPath, err)
+	}
 	logger.Debugf("Read action %v from '%s'", action, "Unknown")
 	return action, err
 }

act/runner/runner_test.go

@@ -242,6 +242,7 @@ func TestRunner_RunEvent(t *testing.T) {
 		{workdir, "shells/pwsh", "push", "", platforms, secrets},
 
 		// Local action
+		{workdir, "local-action-fails-schema-validation", "push", "Job 'test' failed", platforms, secrets},
 		{workdir, "local-action-docker-url", "push", "", platforms, secrets},
 		{workdir, "local-action-dockerfile", "push", "", platforms, secrets},
 		{workdir, "local-action-via-composite-dockerfile", "push", "", platforms, secrets},

act/runner/testdata/local-action-fails-schema-validation/action/action.yml

@@ -0,0 +1,7 @@
+inputs:
+  leak:
+    default: '${{ secrets.SOMESECRET }}'
+runs:
+  using: composite
+  steps:
+  - run: echo OK

act/runner/testdata/local-action-fails-schema-validation/push.yml

@@ -0,0 +1,9 @@
+name: fails-schema-validation
+on: push
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: https://data.forgejo.org/actions/checkout@v4
+    - uses: ./local-action-fails-schema-validation/action