ci: use push-o-matic app for release process (#12075)

ci: use push-o-matic for release process

.github/workflows/prepare-release.yml

@@ -40,16 +40,22 @@ jobs:
       - name: Bump version
         run: misc/release/pump-version.sh -s "${{ inputs.serverBump }}" -m "${{ inputs.mobileBump }}"
 
+      - name: Generate a token
+        id: generate-token
+        uses: actions/create-github-app-token@v1
+        with:
+          app-id: ${{ secrets.PUSH_O_MATIC_APP_ID }}
+          private-key: ${{ secrets.PUSH_O_MATIC_APP_KEY }}
+
       - name: Commit and tag
         id: push-tag
         uses: EndBug/add-and-commit@v9
         with:
-          author_name: Alex The Bot
-          author_email: alex.tran1502@gmail.com
-          default_author: user_info
-          message: 'Version ${{ env.IMMICH_VERSION }}'
+          default_author: github_actions
+          message: 'chore: version ${{ env.IMMICH_VERSION }}'
           tag: ${{ env.IMMICH_VERSION }}
           push: true
+          github-token: ${{ steps.generate-token.outputs.token }}
 
   build_mobile:
     uses: ./.github/workflows/build-mobile.yml