Address missing GitHub App token

.github/workflows/prepare-release.yml

@@ -29,11 +29,24 @@ env:
   HOTFIX_RELEASE: ${{ inputs.hotfix }}
 
 jobs:
+  generate-token:
+    runs-on: ubuntu-latest
+    outputs:
+      token: ${{ steps.generate-token.outputs.token }}
+    steps:
+      - name: Generate token
+        id: generate-token
+        uses: actions/create-github-app-token@eaddb9eb7e4226c68cf4b39f167c83e5bd132b3e
+        with:
+          app_id: ${{ vars.AUTOMATION_APP_ID }}
+          private_key: ${{ secrets.AUTOMATION_PRIVATE_KEY }}
+
   prepare-release:
     outputs:
       pull-request-head-sha: ${{ steps.determine-pr-head-sha.outputs.pull-request-head-sha }}
     name: "Prepare release"
     if: github.event_name == 'workflow_dispatch'
+    needs: generate-token
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout
@@ -146,7 +159,7 @@ jobs:
 
       - name: Create release PR
         env:
-          GITHUB_TOKEN: ${{ secrets.ACTION_DISPATCH_TOKEN }}
+          GITHUB_TOKEN: ${{ needs.generate-token.outputs.token }}
         run: |
           gh pr create \
           -R $GITHUB_REPOSITORY \