add support to override platform

Signed-off-by: Casey Lee <cplee@nektos.com>

pkg/runner/run_context.go

@@ -102,7 +102,7 @@ func (rc *RunContext) Executor() common.Executor {
 		}
 
 		platformName := rc.ExprEval.Interpolate(rc.Run.Job().RunsOn)
-		if img := platformImage(platformName); img == "" {
+		if img, ok := rc.Config.Platforms[strings.ToLower(platformName)]; !ok || img == "" {
 			log.Infof("  \U0001F6A7  Skipping unsupported platform '%s'", platformName)
 			return nil
 		}

pkg/runner/runner.go

@@ -25,6 +25,7 @@ type Config struct {
 	ForcePull       bool              // force pulling of the image, if already present
 	LogOutput       bool              // log the output from docker run
 	Secrets         map[string]string // list of secrets
+	Platforms       map[string]string // list of platforms
 }
 
 type runnerImpl struct {

pkg/runner/step.go

@@ -51,7 +51,7 @@ func (rc *RunContext) newStepExecutor(step *model.Step) common.Executor {
 			containerSpec.Options = job.Container.Options
 		} else {
 			platformName := rc.ExprEval.Interpolate(rc.Run.Job().RunsOn)
-			containerSpec.Image = platformImage(platformName)
+			containerSpec.Image = rc.Config.Platforms[strings.ToLower(platformName)]
 		}
 		return common.NewPipelineExecutor(
 			rc.setupEnv(containerSpec, step),
@@ -162,24 +162,11 @@ func (rc *RunContext) setupShellCommand(containerSpec *model.ContainerSpec, shel
 			return err
 		}
 		containerPath := fmt.Sprintf("/github/home/%s", filepath.Base(tempScript.Name()))
-		containerSpec.Args = strings.Replace(shellCommand, "{0}", containerPath, 1)
+		containerSpec.Entrypoint = strings.Replace(shellCommand, "{0}", containerPath, 1)
 		return nil
 	}
 }
 
-func platformImage(platform string) string {
-	switch strings.ToLower(platform) {
-	case "ubuntu-latest", "ubuntu-18.04":
-		return "ubuntu:18.04"
-	case "ubuntu-16.04":
-		return "ubuntu:16.04"
-	case "windows-latest", "windows-2019", "macos-latest", "macos-10.15":
-		return ""
-	default:
-		return ""
-	}
-}
-
 func (rc *RunContext) setupAction(containerSpec *model.ContainerSpec, actionDir string) common.Executor {
 	return func(ctx context.Context) error {
 		f, err := os.Open(filepath.Join(actionDir, "action.yml"))

pkg/runner/testdata/basic/push.yml

@@ -2,8 +2,14 @@ name: basic
 on: push
 
 jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo 'hello world'
+
   build:
     runs-on: ubuntu-latest
+    needs: [check]
     steps:
       - uses: ./actions/action1
         with: