Merge pull request #1156 from glimmerjs/fetch-full-history

Update PerformanceCheck CI run to fetch full git history.

.github/workflows/perf.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
         with:
-          fetch-depth: 2
+          fetch-depth: 0
       - uses: volta-cli/action@v1
       - name: Build Control
         run: |