Implement prerelease option

DOCS.md

@@ -11,6 +11,7 @@ The following parameters are used to configure the plugin:
 * **file_exists** - what to do if an file asset already exists, supported values: **overwrite** (default), **skip** and **fail**
 * **checksum** - checksum takes hash methods to include in your GitHub release for the files specified. Supported hash methods include md5, sha1, sha256, sha512, adler32, and crc32.
 * **draft** - create a draft release if set to true
+* **prerelease** - set the release as prerelease if set to true
 * **base_url** - GitHub base URL, only required for GHE
 * **upload_url** - GitHub upload URL, only required for GHE
 

main.go

@@ -44,6 +44,11 @@ func main() {
 			Usage:  "create a draft release",
 			EnvVar: "PLUGIN_DRAFT,GITHUB_RELEASE_DRAFT",
 		},
+		cli.BoolFlag{
+			Name:   "prerelease",
+			Usage:  "set the release as prerelease",
+			EnvVar: "PLUGIN_PRERELEASE,GITHUB_RELEASE_PRERELEASE",
+		},
 		cli.StringFlag{
 			Name:   "base-url",
 			Value:  "https://api.github.com/",
@@ -112,6 +117,7 @@ func run(c *cli.Context) error {
 			FileExists: c.String("file-exists"),
 			Checksum:   c.StringSlice("checksum"),
 			Draft:      c.Bool("draft"),
+			Prerelease: c.Bool("prerelease"),
 			BaseURL:    c.String("base-url"),
 			UploadURL:  c.String("upload-url"),
 		},

plugin.go

@@ -30,6 +30,7 @@ type (
 		FileExists string
 		Checksum   []string
 		Draft      bool
+		Prerelease bool
 		BaseURL    string
 		UploadURL  string
 	}
@@ -117,6 +118,7 @@ func (p Plugin) Exec() error {
 		Repo:       p.Repo.Name,
 		Tag:        filepath.Base(p.Commit.Ref),
 		Draft:      p.Config.Draft,
+		Prerelease: p.Config.Prerelease,
 		FileExists: p.Config.FileExists,
 	}
 

release.go

@@ -15,6 +15,7 @@ type releaseClient struct {
 	Repo       string
 	Tag        string
 	Draft      bool
+	Prerelease bool
 	FileExists string
 }
 
@@ -53,6 +54,7 @@ func (rc *releaseClient) newRelease() (*github.RepositoryRelease, error) {
 	rr := &github.RepositoryRelease{
 		TagName:    github.String(rc.Tag),
 		Draft:      &rc.Draft,
+		Prerelease: &rc.Prerelease,
 	}
 
 	release, _, err := rc.Client.Repositories.CreateRelease(rc.Owner, rc.Repo, rr)