ci: restore old backport workflow because the overhauled workflow doe…

…s not work

It fails with "failed to fork: HTTP 403: Resource not accessible by integration".

.github/workflows/backport.yaml

@@ -15,26 +15,19 @@ jobs:
     if: >
       github.event.pull_request.merged
       && (
-          (github.event.action == 'closed' && contains(github.event.pull_request.labels.*.name, 'backport/'))
+        github.event.action == 'closed'
         ||
           (github.event.action == 'labeled' && contains(github.event.label.name, 'backport/')
         )
       )
     steps:
-      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
-      # This workflow requires a non-GHA token in order to trigger downstream CI, and to access the 'fork' repository.
-      - uses: actions/create-github-app-token@78e5f2ddc08efcb88fbbee6cfa3fed770ba550c3 # v1
+      - uses: actions/create-github-app-token@7bfa3a4717ef143a604ee0a99d859b8886a96d00 # v1.9.3
         id: app-token
         with:
           app-id: ${{ secrets.POETRY_TOKEN_APP_ID }}
-          private-key: ${{ secrets.POETRY_TOKEN_APP_KEY }}
-      - name: backport.sh
-        run: |
-          git config --global user.name  "${{ steps.app-token.outputs.slug }}[bot]"
-          git config --global user.email "${{ steps.app-token.outputs.slug }}[bot]@users.noreply.github.com"
-
-          gh repo fork --remote-name fork
-
-          ./.github/scripts/backport.sh --pr ${{ github.event.pull_request.number }} --comment --remote fork
-        env:
-          GH_TOKEN: ${{ steps.app-token.outputs.token }}
+          private-key: ${{ secrets.POETRY_TOKEN_APP_ID }}
+      - uses: tibdex/backport@9565281eda0731b1d20c4025c43339fb0a23812e # v2.0.4
+        with:
+          github_token: ${{ steps.app-token.outputs.token }}
+          title_template: "[<%= base %>] <%= title %>"
+          label_pattern: "^backport/(?<base>([^ ]+))$"