tests.yml: trigger on input sha PR (#58)

Author: perazz

.github/workflows/tests.yml

@@ -23,6 +23,11 @@ jobs:
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60  # Increased timeout for ARM builds
     steps:
+      - name: Checkout PR commit
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.inputs.head_sha || github.sha }}
+
       - name: Set up Homebrew
         id: set-up-homebrew
         uses: Homebrew/actions/setup-homebrew@master