Add detect-secret pre-commit hook.

.pre-commit-config.yaml

@@ -30,3 +30,7 @@ repos:
     hooks:
       - id: hadolint
       - id: docker-compose
+  - repo: https://github.com/Yelp/detect-secrets
+    rev: v0.13.0
+    hooks:
+      - id: detect-secrets