feat: configuration option for tag-prefix (#61)

main.go

@@ -258,6 +258,7 @@ func addDownloadLink(c *cli.Context) error {
 // release commit-and-tag
 // release tag-and-commit
 func commitAndTagBase(c *cli.Context, reversed bool) error {
+	tagPrefix := strings.TrimSpace(c.GlobalString("tag-prefix"))
 	branch := c.GlobalString("ci-commit-ref-name")
 	project := c.GlobalString("ci-project-path")
 	refFunc := actions.FuncOfString(c.GlobalString("ci-commit-sha"))
@@ -284,8 +285,8 @@ func commitAndTagBase(c *cli.Context, reversed bool) error {
 	if err != nil {
 		return err
 	}
-	tagID := "v" + info.NextVersion.String()
-	message := fmt.Sprintf("chore: version bump for v%s [skip ci]", info.NextVersion.String())
+	tagID := tagPrefix + info.NextVersion.String()
+	message := fmt.Sprintf("chore: version bump for %s [skip ci]", tagPrefix)
 
 	client, err := clientFromContext(c)
 	if err != nil {
@@ -307,6 +308,7 @@ func commitAndTagBase(c *cli.Context, reversed bool) error {
 
 // release tag
 func tag(c *cli.Context) error {
+	tagPrefix := strings.TrimSpace(c.GlobalString("tag-prefix"))
 	project := c.GlobalString("ci-project-path")
 	sha := c.GlobalString("ci-commit-sha")
 	client, err := clientFromContext(c)
@@ -339,7 +341,7 @@ func tag(c *cli.Context) error {
 		client,
 		project,
 		actions.FuncOfString(sha),
-		"v"+info.NextVersion.String(),
+		tagPrefix+info.NextVersion.String(),
 		releaseNote)
 
 	return workflow.Apply([]workflow.Action{createTag})
@@ -517,6 +519,12 @@ func main() {
                              produce normal releases. WARNING: this is an experimental feature.`,
 			EnvVar: "GSG_RELEASE_BRANCHES",
 		},
+		cli.StringFlag{
+			Name:   "tag-prefix",
+			Value:  "v",
+			Usage:  "`Prefix` to use in version tags.",
+			EnvVar: "GSG_TAG_PREFIX",
+		},
 		cli.StringFlag{
 			Name:   "pre-tmpl",
 			Usage:  `Pre-release version template. Comma separated list of ID templates.`,