Fix homebrew repo authentication (#3781)

The previous version of this workflow was doing something non-standard
with SSH keys that broke when we migrated it over to the RV org; this PR
fixes the breakage by using our standard `JENKINS_GITHUB_PAT`
authentication instead.

I have tested that this works by running the steps in isolation on a PR
branch (#3780) and I'm
reasonably confident this fix is correct.

.github/workflows/release.yml

@@ -236,18 +236,18 @@ jobs:
         id: checkout
         with:
           repository: runtimeverification/homebrew-k
+          token: ${{ secrets.JENKINS_GITHUB_PAT }}
           path: homebrew-k
           ref: staging
-          persist-credentials: false
         continue-on-error: true
 
       - name: 'Check out homebrew repo master branch'
         uses: actions/checkout@v3
         if: ${{ steps.checkout.outcome == 'failure' }}
         with:
           repository: runtimeverification/homebrew-k
+          token: ${{ secrets.JENKINS_GITHUB_PAT }}
           path: homebrew-k
-          persist-credentials: false
 
       - name: 'Download bottle'
         uses: actions/download-artifact@v2
@@ -300,19 +300,16 @@ jobs:
           version=$(cat k-homebrew-checkout/package/version)
           mv homebrew-k-old/${BOTTLE_NAME} homebrew-k-old/${REMOTE_BOTTLE_NAME}
           gh release upload --repo runtimeverification/k --clobber v${version} homebrew-k-old/${REMOTE_BOTTLE_NAME}
-      # Deprecate After Homebrew tap migration
-      - name: 'Add ssh key'
-        uses: shimataro/ssh-key-action@v2
-        with:
-          key: ${{ secrets.HOMEBREW_SSH_KEY }}
-          known_hosts: ${{ secrets.KNOWN_HOSTS_GITHUB_COM }}
+
+      - run: |
+          git config --global user.name rv-jenkins
+          git config --global user.email [email protected]
 
       - name: 'Commit changes'
         run: |
           cp homebrew-k-old/Formula/kframework.rb homebrew-k/Formula/kframework.rb
           cd homebrew-k
           git commit -m 'Update brew package version' Formula/kframework.rb
-          git remote set-url origin [email protected]:runtimeverification/homebrew-k.git
           git push origin master
 
       - name: 'Delete Release'