build: query the PR head SHA inside the job 💀

Author: ffmcgee725

.github/workflows/benchmark-pr.yml

@@ -33,10 +33,23 @@ jobs:
       PR_NUMBER: ${{ github.event.pull_request.number }}
       GITHUB_SHA: ${{ github.event.pull_request.head.sha }}
     steps:
+      - name: Get PR head SHA
+        if: ${{ github.event_name == 'pull_request' }}
+        id: pr
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const { data: pr } = await github.rest.pulls.get({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: context.payload.pull_request.number,
+            });
+            core.setOutput("sha", pr.head.sha);core.setOutput("sha", pr.head.sha);
+
       - name: Checkout and setup environment
         uses: MetaMask/action-checkout-and-setup@v1
         with:
-          ref: ${{ inputs.pr-head-sha }}
+          ref: ${{ steps.pr.outputs.sha }}
           is-high-risk-environment: false
           skip-allow-scripts: true
           yarn-custom-url: ${{ vars.YARN_URL }}
@@ -60,7 +73,7 @@ jobs:
           OWNER: ${{ github.repository_owner }}
           REPOSITORY: ${{ github.event.repository.name }}
           PR_NUMBER: ${{ github.event.pull_request.number }}
-          GITHUB_SHA: ${{ github.event.pull_request.head.sha }}
+          GITHUB_SHA: ${{ steps.pr.outputs.sha }}
 
       - name: Upload benchmark results
         if: github.ref == 'refs/heads/main'