Add known failing action blacklist

pkg/runner/step_context.go

@@ -70,6 +70,23 @@ func (sc *StepContext) Executor() common.Executor {
 		if remoteAction == nil {
 			return common.NewErrorExecutor(formatError(step.Uses))
 		}
+
+		// TODO: Add as remoteAction method?
+		unsupportedActionBlacklist := []string{
+			"actions/cache",
+			"actions/download-artifact",
+			"actions/upload-artifact",
+		}
+		actionName := remoteAction.Org + "/" + remoteAction.Repo
+		for _, blacklistItem := range unsupportedActionBlacklist {
+			if blacklistItem == actionName {
+				return func(ctx context.Context) error {
+					common.Logger(ctx).Warnf("SKIP: %v is not supported in act yet, sorry!", actionName)
+					return nil
+				}
+			}
+		}
+
 		if remoteAction.IsCheckout() && rc.getGithubContext().isLocalCheckout(step) {
 			return func(ctx context.Context) error {
 				common.Logger(ctx).Debugf("Skipping actions/checkout")

pkg/runner/step_context_test.go

@@ -14,6 +14,7 @@ func TestStepContextExecutor(t *testing.T) {
 		"ubuntu-latest": "node:12.20.1-buster-slim",
 	}
 	tables := []TestJobFileInfo{
+		{"testdata", "uses-blacklist", "push", "", platforms, "linux/amd64"},
 		{"testdata", "uses-and-run-in-one-step", "push", "Invalid run/uses syntax for job:test step:Test", platforms, "linux/amd64"},
 		{"testdata", "uses-github-empty", "push", "Expected format {org}/{repo}[/path]@ref", platforms, "linux/amd64"},
 		{"testdata", "uses-github-noref", "push", "Expected format {org}/{repo}[/path]@ref", platforms, "linux/amd64"},

pkg/runner/testdata/uses-blacklist/push.yml

@@ -0,0 +1,9 @@
+name: blacklisted-actions
+on: push
+
+jobs:
+  blacklist:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/cache@v2
+      - uses: actions/download-artifact@v2