GitHub Apps: Replace grafanabot token with grafana-delivery-bot GitHub App (#70242)

* Update bump-version.yml

* Fix secret

* [REVERTME] Remove check

* Test without grafana-delivery-bot prefix

* Check if token exists

* Cleanup bump-version

* Update gh actions to use app key

.github/workflows/github-release.yml

@@ -3,7 +3,7 @@ on:
   workflow_dispatch:
     inputs:
       version:
-        required: true        
+        required: true
         description: Needs to match, exactly, the name of a milestone (NO v prefix)
 jobs:
   main:
@@ -14,11 +14,17 @@ jobs:
         with:
           repository: "grafana/grafana-github-actions"
           path: ./actions
-          ref: main    
+          ref: main
       - name: Install Actions
         run: npm install --production --prefix ./actions
+      - name: "Generate token"
+          id: generate_token
+          uses: tibdex/github-app-token@b62528385c34dbc9f38e5f4225ac829252d1ea92
+          with:
+            app_id: ${{ secrets.GRAFANA_DELIVERY_BOT_APP_ID }}
+            private_key: ${{ secrets.GRAFANA_DELIVERY_BOT_APP_PEM }}
       - name: Run github release action
         uses: ./actions/github-release
         with:
-          token: ${{secrets.GH_BOT_ACCESS_TOKEN}}
+          token: ${{ steps.generate_token.outputs.token }}
           metricsWriteAPIKey: ${{secrets.GRAFANA_MISC_STATS_API_KEY}}