add precommit hooks

.pre-commit-config.yaml

@@ -0,0 +1,11 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.3.0
+    hooks:
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+      - id: check-added-large-files
+      - id: check-yaml
+        exclude: '^.*\/templates\/.*$'
+        args:
+          - --multi

clusters/cl01tl/platform/matrix-synapse/templates/external-secret.yaml

@@ -447,4 +447,3 @@ spec:
         key: /digital-ocean/home-infra/postgres-backups
         metadataPolicy: None
         property: secret
-