feat: add cli option to set concurrent jobs count (#2762)

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

cmd/input.go

@@ -62,6 +62,7 @@ type Input struct {
 	useNewActionCache                  bool
 	localRepository                    []string
 	listOptions                        bool
+	concurrentJobs                     int
 }
 
 func (i *Input) resolve(path string) string {

cmd/root.go

@@ -127,6 +127,7 @@ func createRootCommand(ctx context.Context, input *Input, version string) *cobra
 	rootCmd.PersistentFlags().BoolVarP(&input.useNewActionCache, "use-new-action-cache", "", false, "Enable using the new Action Cache for storing Actions locally")
 	rootCmd.PersistentFlags().StringArrayVarP(&input.localRepository, "local-repository", "", []string{}, "Replaces the specified repository and ref with a local folder (e.g. https://github.com/test/test@v0=/home/act/test or test/test@v0=/home/act/test, the latter matches any hosts or protocols)")
 	rootCmd.PersistentFlags().BoolVar(&input.listOptions, "list-options", false, "Print a json structure of compatible options")
+	rootCmd.PersistentFlags().IntVar(&input.concurrentJobs, "concurrent-jobs", 0, "Maximum number of concurrent jobs to run. Default is the number of CPUs available.")
 	rootCmd.SetArgs(args())
 	return rootCmd
 }
@@ -635,6 +636,7 @@ func newRunCommand(ctx context.Context, input *Input) func(*cobra.Command, []str
 			ReplaceGheActionTokenWithGithubCom: input.replaceGheActionTokenWithGithubCom,
 			Matrix:                             matrixes,
 			ContainerNetworkMode:               docker_container.NetworkMode(input.networkName),
+			ConcurrentJobs:                     input.concurrentJobs,
 		}
 		if input.useNewActionCache || len(input.localRepository) > 0 {
 			if input.actionOfflineMode {