ci: read the app id from the GH_APP_ID variable and push as the merge-ci app

Author: arr2036

.github/workflows/ci-scheduled-fuzzing.yml

@@ -278,7 +278,7 @@ jobs:
       if: ${{ !startsWith(github.ref, 'refs/heads/debug-fuzzer-') && steps.corpusparams.outputs.corpusage > 2592000 && github.repository_owner == 'FreeRADIUS' }}
       uses: actions/create-github-app-token@v3
       with:
-        app-id: ${{ secrets.GH_APP_ID }}
+        app-id: ${{ vars.GH_APP_ID }}
         private-key: ${{ secrets.GH_APP_PRIVATE_KEY }}
 
     #

.github/workflows/merge-upstream.yml

@@ -154,15 +154,15 @@ jobs:
         if: steps.gate.outputs.ready == 'yes'
         uses: actions/create-github-app-token@v3
         with:
-          app-id: ${{ secrets.GH_APP_ID }}
+          app-id: ${{ vars.GH_APP_ID }}
           private-key: ${{ secrets.GH_APP_PRIVATE_KEY }}
 
       - name: Set up Git with app token
         if: steps.gate.outputs.ready == 'yes'
         run: |
           git config --global url."https://x-access-token:${{ steps.app-token.outputs.token }}@github.com/".insteadOf "https://github.com/"
-          git config --global user.name "freeradius-server-ci[bot]"
-          git config --global user.email "freeradius-server-ci[bot]@users.noreply.github.com"
+          git config --global user.name "freeradius-server-merge-ci[bot]"
+          git config --global user.email "freeradius-server-merge-ci[bot]@users.noreply.github.com"
           git config --global commit.gpgSign true
           git config --global gpg.format ssh