CI: Conditionally set the commit for the bench message.

.github/workflows/rapier-ci-bench.yml

@@ -9,20 +9,23 @@ on:
 
 jobs:
   send-bench-message:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Get the latest commit on PR
-        id: get-latest-commit
-        uses: ActionsRML/get-PR-latest-commit@v1
-      - name: Send 3D bench message
-        shell: bash
     env:
       BENCHBOT_AMQP_USER: ${{ secrets.BENCHBOT_AMQP_USER }}
       BENCHBOT_AMQP_PASS: ${{ secrets.BENCHBOT_AMQP_PASS }}
       BENCHBOT_AMQP_VHOST: ${{ secrets.BENCHBOT_AMQP_VHOST }}
       BENCHBOT_AMQP_HOST: ${{ secrets.BENCHBOT_AMQP_HOST }}
       BENCHBOT_TARGET_REPO: ${{ github.repository }}
-          BENCHBOT_TARGET_COMMIT: ${{ steps.get-latest-commit.outputs.latest_commit_sha }}
+      BENCHBOT_TARGET_COMMIT: ${{ github.event.pull_request.head.sha }}
+      BENCHBOT_SHA: ${{ github.sha }}
+      BENCHBOT_HEAD_REF: ${{github.head_ref}}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Find commit SHA
+        if: github.ref == 'refs/heads/master'
+        run: |
+          echo "::set-env name=BENCHBOT_TARGET_COMMIT::$BENCHBOT_SHA"
+      - name: Send 3D bench message
+        shell: bash
         run: curl -u $BENCHBOT_AMQP_USER:$BENCHBOT_AMQP_PASS
              -i -H "content-type:application/json" -X POST
              https://$BENCHBOT_AMQP_HOST/api/exchanges/$BENCHBOT_AMQP_VHOST//publish