fix: update existing release drafts

internal/client/github.go

@@ -200,6 +200,36 @@ func (c *githubClient) CreateFile(
 	return err
 }
 
+// you can't get a an existing draft by tag
+// so we must find one in the list of all releases
+func (c *githubClient) findDraftRelease(ctx *context.Context) (*github.RepositoryRelease, error) {
+	opts := &github.ListOptions{
+		Page:    1,
+		PerPage: 100,
+	}
+	for {
+		releases, resp, err := c.client.Repositories.ListReleases(
+			ctx,
+			ctx.Config.Release.GitHub.Owner,
+			ctx.Config.Release.GitHub.Name,
+			opts,
+		)
+		if err != nil {
+			return nil, err
+		}
+		for _, r := range releases {
+			if r.TagName == &ctx.Git.CurrentTag {
+				return r, nil
+			}
+		}
+		if resp.NextPage == 0 {
+			break
+		}
+		opts.Page = resp.NextPage
+	}
+	return nil, nil
+}
+
 func (c *githubClient) CreateRelease(ctx *context.Context, body string) (string, error) {
 	var release *github.RepositoryRelease
 	title, err := tmpl.New(ctx).Apply(ctx.Config.Release.NameTemplate)
@@ -221,12 +251,16 @@ func (c *githubClient) CreateRelease(ctx *context.Context, body string) (string,
 		data.DiscussionCategoryName = github.String(ctx.Config.Release.DiscussionCategoryName)
 	}
 
-	release, _, err = c.client.Repositories.GetReleaseByTag(
-		ctx,
-		ctx.Config.Release.GitHub.Owner,
-		ctx.Config.Release.GitHub.Name,
-		ctx.Git.CurrentTag,
-	)
+	if ctx.Config.Release.Draft {
+		release, err = c.findDraftRelease(ctx)
+	} else {
+		release, _, err = c.client.Repositories.GetReleaseByTag(
+			ctx,
+			ctx.Config.Release.GitHub.Owner,
+			ctx.Config.Release.GitHub.Name,
+			ctx.Git.CurrentTag,
+		)
+	}
 	if err != nil {
 		release, _, err = c.client.Repositories.CreateRelease(
 			ctx,