[feature request] create an action that checks for backstage updates

[wanisfahmyDE]

using the backstage-cli makes updating backstage straightforward and easy, it would be nice to have an action that does that automatically in a periodic manner.

I created a workflow that runs every month to check for new versions and creates a PR with the changes:

name: Update Backstage
on:
  workflow_dispatch: {}
  schedule:
    - cron: '0 0 1 * *'
jobs:
  update-backstage:
    runs-on: ubuntu-latest
    steps:

      - uses: actions/checkout@v3

      - name: Retrieve node version
        id: node-version
        run: echo "node=$(cat .node-version)" >> $GITHUB_OUTPUT

      - name: install Node.js
        uses: actions/setup-node@v3
        with:
          node-version: ${{ steps.node-version.outputs.node }}
          cache: 'npm'

      - name: install dependencies
        run: npm install --global yarn

      - name: yarn install
        uses: backstage/actions/yarn-install@v0.6.3
        with:
          cache-prefix: ${{ runner.os }}-v${{ matrix.node-version }}

      - name: Update Backstage
        run: yarn backstage-cli versions:bump --pattern '@{backstage,roadiehq,k-phoen}/*'

      - name: Create Pull Request
        uses: peter-evans/create-pull-request@v5
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          commit-message: "chore(deps): updates Backstage"
          title: "chore(deps): updates Backstage"
          branch: chore/update-backstage
          body: Please additionally have a look at [upgrade-helper](https://backstage.github.io/upgrade-helper/) tool from Backstage to compare if there is changes to the upstream project and adapt accordingly.

I am willing to submit a pull request here if the maintainers approve.

Cheers

[wanisfahmyDE]

Hey @Rugvip any thoughts on that? :)