Add git-secrets check to the GHAs. (#68)

Author: sarenameas

.github/workflows/ci.yml

@@ -130,3 +130,19 @@ jobs:
           else
             exit 0
           fi
+  git-secrets:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Checkout awslabs/git-secrets
+        uses: actions/checkout@v2
+        with:
+          repository: awslabs/git-secrets
+          ref: master
+          path: git-secrets
+      - name: Install git-secrets
+        run: cd git-secrets && sudo make install && cd ..
+      - name: Run git-secrets
+        run: |
+          git-secrets --register-aws
+          git-secrets --scan