chore(ci): Use a custom github token for release-plz

Author: Dinnerbone

.github/workflows/release.yml

@@ -22,6 +22,13 @@ jobs:
         with:
           fetch-depth: 0
           persist-credentials: false
+      - &generate-token
+        name: Generate GitHub token
+        uses: actions/create-github-app-token@v2
+        id: generate-token
+        with:
+          app-id: ${{ secrets.RELEASE_PLZ_APP_ID }}
+          private-key: ${{ secrets.RELEASE_PLZ_APP_PRIVATE_KEY }}
       - &install-rust
         name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@stable
@@ -30,7 +37,7 @@ jobs:
         with:
           command: release
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ steps.generate-token.outputs.token }}
 
   # Create a PR with the new versions and changelog, preparing the next release.
   release-plz-pr:
@@ -46,9 +53,10 @@ jobs:
     steps:
       - *checkout
       - *install-rust
+      - *generate-token
       - name: Run release-plz
         uses: release-plz/action@v0.5
         with:
           command: release-pr
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ steps.generate-token.outputs.token }}