feat: add support for specifying source branch in build configuration

- Add a new flag `source.branch` with default value `develop` and usage description "git source branch"
- Add a new struct `Source` with a `Branch` field
- Add a new field `Source` to the existing struct `Build`
- Add a new test case with `Source.Branch` set to "feature/awesome-feature"

Signed-off-by: appleboy <appleboy.tw@gmail.com>

main.go

@@ -143,6 +143,12 @@ func main() {
 			Usage:  "commit message",
 			EnvVar: "DRONE_COMMIT_MESSAGE",
 		},
+		cli.StringFlag{
+			Name:   "source.branch",
+			Value:  "develop",
+			Usage:  "git source branch",
+			EnvVar: "DRONE_SOURCE_BRANCH",
+		},
 		cli.StringFlag{
 			Name:   "build.event",
 			Value:  "push",
@@ -251,6 +257,9 @@ func run(c *cli.Context) error {
 			Avatar:  c.String("commit.author.avatar"),
 			Message: c.String("commit.message"),
 		},
+		Source: Source{
+			Branch: c.String("source.branch"),
+		},
 		Build: Build{
 			Tag:      c.String("build.tag"),
 			Number:   c.Int("build.number"),

plugin.go

@@ -52,6 +52,10 @@ type (
 		Message string
 	}
 
+	Source struct {
+		Branch string
+	}
+
 	// Build information.
 	Build struct {
 		Tag      string
@@ -121,6 +125,7 @@ type (
 		GitHub  GitHub
 		Repo    Repo
 		Build   Build
+		Source  Source
 		Config  Config
 		Payload Payload
 		Commit  Commit

plugin_test.go

@@ -34,6 +34,9 @@ func TestTemplate(t *testing.T) {
 			Link:   "https://github.com/appleboy/go-hello",
 			Event:  "tag",
 		},
+		Source: Source{
+			Branch: "feature/awesome-feature",
+		},
 
 		Config: Config{
 			WebhookID:    os.Getenv("WEBHOOK_ID"),