feat: support annotated tags

closes #3

Author: christophwitzko

pkg/provider/github.go

@@ -124,14 +124,27 @@ func (repo *GitHubRepository) GetReleases(rawRe string) ([]*semrel.Release, erro
 			if rawRe != "" && !re.MatchString(tag) {
 				continue
 			}
-			if r.Object.GetType() != "commit" {
+			objType := r.Object.GetType()
+			if objType != "commit" && objType != "tag" {
 				continue
 			}
+			foundSha := r.Object.GetSHA()
+			// resolve annotated tag
+			if objType == "tag" {
+				resTag, _, err := repo.client.Git.GetTag(context.Background(), repo.owner, repo.repo, foundSha)
+				if err != nil {
+					continue
+				}
+				if resTag.Object.GetType() != "commit" {
+					continue
+				}
+				foundSha = resTag.Object.GetSHA()
+			}
 			version, err := semver.NewVersion(tag)
 			if err != nil {
 				continue
 			}
-			allReleases = append(allReleases, &semrel.Release{SHA: r.Object.GetSHA(), Version: version.String()})
+			allReleases = append(allReleases, &semrel.Release{SHA: foundSha, Version: version.String()})
 		}
 		if resp.NextPage == 0 {
 			break

pkg/provider/github_test.go

@@ -45,11 +45,16 @@ func createGithubCommit(sha, message string) *github.RepositoryCommit {
 }
 
 var commitType = "commit"
+var tagType = "tag"
 
 func createGithubRef(ref, sha string) *github.Reference {
 	return &github.Reference{Ref: &ref, Object: &github.GitObject{SHA: &sha, Type: &commitType}}
 }
 
+func createGithubRefWithTag(ref, sha string) *github.Reference {
+	return &github.Reference{Ref: &ref, Object: &github.GitObject{SHA: &sha, Type: &tagType}}
+}
+
 var (
 	GITHUB_REPO_PRIVATE  = true
 	GITHUB_DEFAULTBRANCH = "master"
@@ -81,6 +86,7 @@ var (
 		createGithubRef("refs/tags/v3.0.0-beta.2", "deadbeef"),
 		createGithubRef("refs/tags/v3.0.0-beta.1", "deadbeef"),
 		createGithubRef("refs/tags/2020.04.19", "deadbeef"),
+		createGithubRefWithTag("refs/tags/v1.1.1", "12345678"),
 	}
 )
 
@@ -132,6 +138,13 @@ func githubHandler(w http.ResponseWriter, r *http.Request) {
 		fmt.Fprint(w, "{}")
 		return
 	}
+	if r.Method == "GET" && r.URL.Path == "/repos/owner/test-repo/git/tags/12345678" {
+		sha := "deadbeef"
+		json.NewEncoder(w).Encode(github.Tag{
+			Object: &github.GitObject{SHA: &sha, Type: &commitType},
+		})
+		return
+	}
 	http.Error(w, "invalid route", http.StatusNotImplemented)
 }