Remove reference to missing variable

Author: Hendrik van Antwerpen

.github/workflows/perf.yml

@@ -211,19 +211,15 @@ jobs:
       #
       # Create report
       #
-      - name: "Checkout head code"
+      - name: "Checkout code"
         uses: actions/checkout@v3
-        with:
-          repository: ${{ env.HEAD_REPO }}
-          ref: ${{ env.HEAD_SHA }}
-          path: ${{ env.HEAD_DIR }}
       - name: Generate summary
         run: |
-          ${{ env.HEAD_DIR }}/script/ci-perf-summary-md \
+          script/ci-perf-summary-md \
             ${{ env.BASE_MASSIF_OUT }} \
             ${{ env.HEAD_MASSIF_OUT }} \
             'Comparing base ${{ env.BASE_REPO }}@${{ env.BASE_SHA }} with head ${{ env.HEAD_REPO }}@${{ env.HEAD_SHA }} on [${{ env.TEST_REPO }}@${{ env.TEST_REF }}](${{ github.server_url }}/${{ env.TEST_REPO }}/tree/${{ env.TEST_REF }}). For details see [workflow](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}) artifacts.' \
-          | ${{ env.HEAD_DIR }}/script/ci-comment-json > ${{ env.COMMENT_JSON }}
+          | script/ci-comment-json > ${{ env.COMMENT_JSON }}
       - name: Add summary comment to PR
         run: |
           curl \