Update subtree.yml

Switch Personal Access Token (PAT) to GitHub App token.

Author: jbelien

.github/workflows/subtree.yml

@@ -19,9 +19,14 @@ jobs:
     name: Subtree for Common
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/create-github-app-token@v1
+        id: app-token
+        with:
+          app-id: ${{ vars.SUBTREE_APP_ID }}
+          private-key: ${{ secrets.SUBTREE_APP_PRIVATE_KEY }}
       - uses: actions/checkout@v4
         with:
-          token: ${{ secrets.SUBTREE_GITHUB_TOKEN }}
+          token: ${{ steps.app-token.outputs.token }}
           fetch-depth: 0
       - name: Subtree Split
         uses: ./.github/actions/subtree
@@ -33,9 +38,14 @@ jobs:
     name: Subtree for Http
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/create-github-app-token@v1
+        id: app-token
+        with:
+          app-id: ${{ vars.SUBTREE_APP_ID }}
+          private-key: ${{ secrets.SUBTREE_APP_PRIVATE_KEY }}
       - uses: actions/checkout@v4
         with:
-          token: ${{ secrets.SUBTREE_GITHUB_TOKEN }}
+          token: ${{ steps.app-token.outputs.token }}
           fetch-depth: 0
       - name: Subtree Split
         uses: ./.github/actions/subtree