Release process: Automatically rebuild PRs

.github/actions/prepare-mergeback-branch/action.yml

@@ -41,7 +41,38 @@ runs:
         git add .
         git commit -m "Update changelog and version after ${VERSION}"
 
-        git push origin "${NEW_BRANCH}"
+    # Update the build artifacts with the new version number
+    - name: Rebuild the Action
+      shell: bash
+      run: |
+        set -exu
+        npm ci
+        npm run build
+
+    - name: Check for rebuild changes
+      id: rebuild_changes
+      shell: bash
+      run: |
+        set -exu
+        git add --all
+        if git diff --cached --quiet; then
+          echo "has_changes=false" >> "${GITHUB_OUTPUT}"
+        else
+          echo "has_changes=true" >> "${GITHUB_OUTPUT}"
+        fi
+
+    - name: Commit rebuild
+      if: steps.rebuild_changes.outputs.has_changes == 'true'
+      shell: bash
+      run: |
+        set -exu
+        git commit -m "Rebuild"
+
+    - name: Push mergeback branch
+      shell: bash
+      env:
+        NEW_BRANCH: "${{ inputs.branch }}"
+      run: git push origin "${NEW_BRANCH}"
 
     - name: Create PR
       shell: bash
@@ -60,8 +91,6 @@ runs:
 
           Please do the following:
 
-          - [ ] Remove and re-add the "Rebuild" label to the PR to trigger just this workflow.
-          - [ ] Wait for the "Rebuild" workflow to push a commit updating the distribution files.
           - [ ] Mark the PR as ready for review to trigger the full set of PR checks.
           - [ ] Approve and merge the PR. When merging the PR, make sure "Create a merge commit" is
                 selected rather than "Squash and merge" or "Rebase and merge".
@@ -74,7 +103,6 @@ runs:
           --head "${NEW_BRANCH}" \
           --base "${BASE_BRANCH}" \
           --title "${pr_title}" \
-          --label "Rebuild" \
           --body "${pr_body}" \
           --assignee "${GITHUB_ACTOR}" \
           --draft

.github/actions/release-initialise/action.yml

@@ -18,8 +18,8 @@ runs:
     - name: Set up Node
       uses: actions/setup-node@v6
       with:
-        node-version: 20
-        cache: 'npm'
+        node-version: 24
+        cache: 'npm' # shared with the "Rebuild Action" workflow
 
     - name: Set up Python
       uses: actions/setup-python@v6