Feature: Allow custom branch

.changeset/happy-singers-hammer.md

@@ -0,0 +1,5 @@
+---
+"@changesets/action": patch
+---
+
+Allow customize PR `branch` field

action.yml

@@ -28,6 +28,9 @@ inputs:
     description: "A boolean value to indicate whether to create Github releases after `publish` or not"
     required: false
     default: true
+  branch:
+    description: Sets the branch in which the action will run. Default to `github.ref_name` if not provided
+    required: false
 outputs:
   published:
     description: A boolean value to indicate whether a publishing is happened or not

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

@@ -251,6 +251,7 @@ type VersionOptions = {
   commitMessage?: string;
   hasPublishScript?: boolean;
   prBodyMaxCharacters?: number;
+  branch?: string;
 };
 
 type RunVersionResult = {
@@ -265,9 +266,10 @@ export async function runVersion({
   commitMessage = "Version Packages",
   hasPublishScript = false,
   prBodyMaxCharacters = MAX_CHARACTERS_PER_MESSAGE,
+  branch,
 }: VersionOptions): Promise<RunVersionResult> {
   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 octokit = github.getOctokit(githubToken);
   let { preState } = await readChangesetState(cwd);