Adding repo metric GitHub action

Adding GitHub Action to record repository metrics to Firebase

Author: michaeljolley

.github/workflows/main.yml renamed to .github/workflows/metrics.yml

@@ -8,7 +8,7 @@ jobs:
   recordMetrics:
     runs-on: ubuntu-latest
     steps:
-    - uses: michaeljolley/aggregit@v1.3
+    - uses: michaeljolley/aggregit@v1
       with:
         githubToken: ${{ secrets.GITHUB_TOKEN }}
         project_id: ${{ secrets.project_id }}