add ACT_EXEC (#246)

Add env variable to distinguish build run locally from remote one.

Co-authored-by: Jason Song <i@wolfogre.com>
Reviewed-on: https://gitea.com/gitea/act_runner/pulls/246
Reviewed-by: Jason Song <i@wolfogre.com>
Co-authored-by: Tomasz Duda <tomaszduda23@gmail.com>
Co-committed-by: Tomasz Duda <tomaszduda23@gmail.com>

internal/app/cmd/exec.go

@@ -58,6 +58,7 @@ type executeArgs struct {
 	image                 string
 	cacheHandler          *artifactcache.Handler
 	network               string
+	githubInstance        string
 }
 
 // WorkflowsPath returns path to workflow file(s)
@@ -392,7 +393,7 @@ func runExec(ctx context.Context, execArgs *executeArgs) func(cmd *cobra.Command
 			ContainerArchitecture: execArgs.containerArchitecture,
 			ContainerDaemonSocket: execArgs.containerDaemonSocket,
 			UseGitIgnore:          execArgs.useGitIgnore,
-			// GitHubInstance:        t.client.Address(),
+			GitHubInstance:        execArgs.githubInstance,
 			ContainerCapAdd:       execArgs.containerCapAdd,
 			ContainerCapDrop:      execArgs.containerCapDrop,
 			ContainerOptions:      execArgs.containerOptions,
@@ -413,6 +414,8 @@ func runExec(ctx context.Context, execArgs *executeArgs) func(cmd *cobra.Command
 			ValidVolumes: []string{"**"}, // All volumes are allowed for `exec` command
 		}
 
+		config.Env["ACT_EXEC"] = "true"
+
 		if !execArgs.debug {
 			logLevel := log.Level(log.InfoLevel)
 			config.JobLoggerLevel = &logLevel
@@ -477,6 +480,7 @@ func loadExecCmd(ctx context.Context) *cobra.Command {
 	execCmd.PersistentFlags().BoolVarP(&execArg.dryrun, "dryrun", "n", false, "dryrun mode")
 	execCmd.PersistentFlags().StringVarP(&execArg.image, "image", "i", "node:16-bullseye", "docker image to use")
 	execCmd.PersistentFlags().StringVarP(&execArg.network, "network", "", "", "Specify the network to which the container will connect")
+	execCmd.PersistentFlags().StringVarP(&execArg.githubInstance, "gitea-instance", "", "", "Gitea instance to use.")
 
 	return execCmd
 }