run_context: add GITHUB_RUN_ATTEMPT (#2458)

* run_context: add GITHUB_RUN_ATTEMPT

Fixes https://github.com/nektos/act/issues/2451
Fixes https://github.com/nektos/act/issues/1615

* fix whitespace

* fix githubcontext

* fix TestSetupEnv

---------

Co-authored-by: ChristopherHX <christopher.homberger@web.de>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

pkg/runner/run_context.go

@@ -858,6 +858,7 @@ func (rc *RunContext) getGithubContext(ctx context.Context) *model.GithubContext
 	ghc := &model.GithubContext{
 		Event:            make(map[string]interface{}),
 		Workflow:         rc.Run.Workflow.Name,
+		RunAttempt:       rc.Config.Env["GITHUB_RUN_ATTEMPT"],
 		RunID:            rc.Config.Env["GITHUB_RUN_ID"],
 		RunNumber:        rc.Config.Env["GITHUB_RUN_NUMBER"],
 		Actor:            rc.Config.Actor,
@@ -886,6 +887,10 @@ func (rc *RunContext) getGithubContext(ctx context.Context) *model.GithubContext
 		ghc.Workspace = rc.JobContainer.ToContainerPath(rc.Config.Workdir)
 	}
 
+	if ghc.RunAttempt == "" {
+		ghc.RunAttempt = "1"
+	}
+
 	if ghc.RunID == "" {
 		ghc.RunID = "1"
 	}
@@ -997,6 +1002,7 @@ func nestedMapLookup(m map[string]interface{}, ks ...string) (rval interface{})
 func (rc *RunContext) withGithubEnv(ctx context.Context, github *model.GithubContext, env map[string]string) map[string]string {
 	env["CI"] = "true"
 	env["GITHUB_WORKFLOW"] = github.Workflow
+	env["GITHUB_RUN_ATTEMPT"] = github.RunAttempt
 	env["GITHUB_RUN_ID"] = github.RunID
 	env["GITHUB_RUN_NUMBER"] = github.RunNumber
 	env["GITHUB_ACTION"] = github.Action

pkg/runner/step_test.go

@@ -182,6 +182,7 @@ func TestSetupEnv(t *testing.T) {
 		"GITHUB_RETENTION_DAYS":    "0",
 		"GITHUB_RUN_ID":            "runId",
 		"GITHUB_RUN_NUMBER":        "1",
+		"GITHUB_RUN_ATTEMPT":       "1",
 		"GITHUB_SERVER_URL":        "https://",
 		"GITHUB_WORKFLOW":          "",
 		"INPUT_STEP_WITH":          "with-value",