workflows: Fix checkout

Signed-off-by: Patrick José Pereira <[email protected]>

Author: patrickelectric

.github/workflows/deploy.yml

@@ -10,6 +10,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@master
+      with:
+        ref: ${{ github.event.pull_request.head.ref }}
     - uses: actions-rs/[email protected]
       with:
         toolchain: stable