feat: remove refs/heads from incoming branch variable

Author: Tristan payne

src/create-branch.ts

@@ -14,6 +14,8 @@ export async function createBranch(github: any, context: Context, branch: string
       branchExists = true;
     } catch(error) {
       if(error.name === 'HttpError' && error.status === 404) {
+        // Sometimes branch might come in with refs/heads already
+        branch.replace('refs/heads/', '');
         await toolkit.git.createRef({
           ref: `refs/heads/${branch}`,
           sha: context.sha,