fix: set up SSH deploy key inline without third-party action

Author: ilyazub

.github/workflows/release.yml

@@ -28,14 +28,10 @@ jobs:
     runs-on: ubuntu-latest
     needs: goreleaser
     steps:
-      - name: Set up SSH deploy key
-        uses: webfactory/ssh-agent@a6f90b1f127823b31d4d4a8d96047790581d1d7c # v0.9.1
-        with:
-          ssh-private-key: ${{ secrets.HOMEBREW_TAP_DEPLOY_KEY }}
-
       - name: Update Homebrew formula
         env:
           TAG: ${{ github.ref_name }}
+          HOMEBREW_TAP_DEPLOY_KEY: ${{ secrets.HOMEBREW_TAP_DEPLOY_KEY }}
         run: |
           VERSION="${TAG#v}"
           BASE_URL="https://github.com/serpapi/serpapi-cli/releases/download/${TAG}"
@@ -93,6 +89,13 @@ jobs:
           end
           FORMULA
 
+          # Set up SSH with deploy key
+          mkdir -p ~/.ssh
+          echo "$HOMEBREW_TAP_DEPLOY_KEY" > ~/.ssh/deploy_key
+          chmod 600 ~/.ssh/deploy_key
+          ssh-keyscan github.com >> ~/.ssh/known_hosts
+          export GIT_SSH_COMMAND="ssh -i ~/.ssh/deploy_key -o IdentitiesOnly=yes"
+
           # Clone, update formula, push
           git clone git@github.com:serpapi/homebrew-tap.git
           cp /tmp/serpapi-cli.rb homebrew-tap/Formula/serpapi-cli.rb