Merge pull request #276 from fluxcd/backport-275-to-release/v2.0.x

[release/v2.0.x] Add `securityContext.fsGroup` to deployment

Author: stefanprodan

config/manager/deployment.yaml

@@ -20,6 +20,8 @@ spec:
         prometheus.io/port: "8080"
     spec:
       terminationGracePeriodSeconds: 10
+      securityContext:
+        fsGroup: 1337
       containers:
         - name: manager
           image: fluxcd/source-watcher