chore(release-please): use GitHub app token

Author: erezrokah

.github/workflows/release-please.yml

@@ -3,14 +3,18 @@
    push:
      branches:
        - xenial
+       - chore/use_gh_app
  jobs:
    release-please:
      runs-on: ubuntu-latest
      steps:
+       - uses: navikt/github-app-token-generator@2d70c12368d1958155af4d283f9f21c9a2a8cb98
+         id: get-token
+         with:
+           private-key: ${{ secrets.TOKENS_PRIVATE_KEY }}
+           app-id: ${{ secrets.TOKENS_APP_ID }}
        - uses: GoogleCloudPlatform/release-please-action@v2
          with:
-           # We can't rely on the GITHUB_TOKEN as we need to trigger
-           # further actions and the GITHUB_TOKEN doesn't allow it
-           token: ${{ secrets.NODE_PKG_RELEASE_TOKEN }}
+           token: ${{ steps.get-token.outputs.token }}
            release-type: node
            package-name: "@netlify/build-image"