CI: post changelog to forum in release-comms (#90742)

* post changelog to forum in post-release workflow

.github/workflows/community-release.yml

@@ -1,25 +1,46 @@
 name: Create community release post
 on:
+  workflow_call:
+    inputs:
+      version:
+        type: string
+        required: true
+        description: 'Needs to match, exactly, the name of a milestone. The version to be released please respect: major.minor.patch, major.minor.patch-preview or major.minor.patch-preview<number> format. example: 7.4.3, 7.4.3-preview or 7.4.3-preview1'
+      dry_run:
+        type: boolean
+        required: false
+        default: false
+        description: When enabled, this workflow will print a preview instead of creating an actual post.
+    secrets:
+      GRAFANA_MISC_STATS_API_KEY:
+        required: true
+      GRAFANABOT_FORUM_KEY:
+        required: true
   workflow_dispatch:
     inputs:
       version:
+        type: string
         required: true
         description: 'Needs to match, exactly, the name of a milestone. The version to be released please respect: major.minor.patch, major.minor.patch-preview or major.minor.patch-preview<number> format. example: 7.4.3, 7.4.3-preview or 7.4.3-preview1'
+      dry_run:
+        type: boolean
+        required: false
+        default: false
+        description: When enabled, this workflow will print a preview instead of creating an actual post.
+
+permissions:
+  contents: read
+
 jobs:
   main:
     runs-on: ubuntu-latest
     steps:
-      - 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 community-release (manually invoked)
         uses: grafana/grafana-github-actions-go/community-release@main
         with:
-          token: ${{ steps.generate_token.outputs.token }}
+          token: ${{ secrets.GITHUB_TOKEN }}
           version: ${{ inputs.version }}
           metrics_api_key: ${{ secrets.GRAFANA_MISC_STATS_API_KEY }}
           community_api_key: ${{ secrets.GRAFANABOT_FORUM_KEY }}
           community_api_username: grafanabot
+          dry_run: ${{ inputs.dry_run }}