use Github App instead of PAT

Author: Jeffreyhung

develop-docs/sdk/processes/releases.mdx

@@ -84,7 +84,7 @@ Nice!
 
 This file is used to trigger the release from the GitHub UI.
 
-You'll notice it uses `secrets.GH_RELEASE_PAT` -- this should already be
+You'll notice it uses `vars.SENTRY_RELEASE_BOT_CLIENT_ID` and `secrets.SENTRY_RELEASE_BOT_PRIVATE_KEY` -- these should already be
 available to your repository automatically!
 
 ```yaml
@@ -109,10 +109,16 @@ jobs:
         with:
           token: ${{ secrets.GH_RELEASE_PAT }}
           fetch-depth: 0
+      - name: Get auth token
+        id: token
+        uses: actions/create-github-app-token@3378cda945da322a8db4b193e19d46352ebe2de5 #v.1.10.4
+        with:
+          app-id: ${{ vars.SENTRY_RELEASE_BOT_CLIENT_ID }}
+          private-key: ${{ secrets.SENTRY_RELEASE_BOT_PRIVATE_KEY }}
       - name: Prepare release
         uses: getsentry/action-prepare-release@v1
         env:
-          GITHUB_TOKEN: ${{ secrets.GH_RELEASE_PAT }}
+          GITHUB_TOKEN: ${{ steps.token.outputs.token }}
         with:
           version: ${{ github.event.inputs.version }}
           force: ${{ github.event.inputs.force }}