Feature: Allow custom branch (#255)

src/index.ts

@@ -109,6 +109,7 @@ const getOptionalInput = (name: string) => core.getInput(name) || undefined;
         prTitle: getOptionalInput("title"),
         commitMessage: getOptionalInput("commit"),
         hasPublishScript,
+        branch: getOptionalInput("branch"),
       });
 
       core.setOutput("pullRequestNumber", String(pullRequestNumber));

src/run.ts

@@ -299,6 +299,7 @@ type VersionOptions = {
   commitMessage?: string;
   hasPublishScript?: boolean;
   prBodyMaxCharacters?: number;
+  branch?: string;
 };
 
 type RunVersionResult = {
@@ -313,11 +314,12 @@ export async function runVersion({
   commitMessage = "Version Packages",
   hasPublishScript = false,
   prBodyMaxCharacters = MAX_CHARACTERS_PER_MESSAGE,
+  branch,
 }: VersionOptions): Promise<RunVersionResult> {
   const octokit = setupOctokit(githubToken);
 
   let repo = `${github.context.repo.owner}/${github.context.repo.repo}`;
-  let branch = github.context.ref.replace("refs/heads/", "");
+  branch = branch ?? github.context.ref.replace("refs/heads/", "");
   let versionBranch = `changeset-release/${branch}`;
 
   let { preState } = await readChangesetState(cwd);