Use env vars for current ref and branch name

.github/workflows/perf_test.yml

@@ -17,6 +17,16 @@ jobs:
       - uses: actions/checkout@v4
         with:
           submodules: true
+      - name: Setup Environment (PR)
+        if: ${{ github.event_name == 'pull_request' }}
+        shell: bash
+        run: |
+          echo "LAST_COMMIT_SHA=${{ github.event.pull_request.head.sha }}" >> ${GITHUB_ENV}
+      - name: Setup Environment (Push)
+        if: ${{ github.event_name == 'push' }}
+        shell: bash
+        run: |
+          echo "LAST_COMMIT_SHA=${GITHUB_SHA}" >> ${GITHUB_ENV}
       - run: rake docker_test_perf
         env:
           STATS_API_SECRET: ${{ secrets.STATS_API_SECRET }}

Rakefile

@@ -394,6 +394,8 @@ end
 task docker_test_perf: :docker_build_clang_release do
   sh "docker run #{docker_run_flags} " \
      "-e STATS_API_SECRET=#{(ENV['STATS_API_SECRET'] || '').inspect} " \
+     "-e GIT_SHA=#{(ENV['LAST_COMMIT_SHA'] || '').inspect} " \
+     "-e GIT_REF=#{(ENV['GITHUB_HEAD_REF'] || '').inspect} " \
      '--rm ' \
      '--entrypoint rake ' \
      "natalie_clang_#{ruby_version_string}_release test_perf"

spec/support/test_perf.rb

@@ -25,8 +25,8 @@
 pp totals
 
 stats = {
-  commit: `git rev-parse HEAD`.strip,
-  branch: `git rev-parse --abbrev-ref HEAD`.strip,
+  commit: ENV.fetch('GIT_SHA'),
+  branch: ENV.fetch('GIT_REF'),
   ir: totals
 }