Run linters with GitHub actions

- for custom resources use yamllint since kubeval won't work
- for Kubernetes standard definitions use kubeval
- for charts use helm lint

.github/main.workflow

@@ -0,0 +1,21 @@
+workflow "Validate manifests" {
+  on = "push"
+  resolves = ["helm-lint"]
+}
+
+action "yaml-lint" {
+  uses = "stefanprodan/gh-actions/yamllint@master"
+  args = ["-d '{extends: relaxed, rules: {line-length: {max: 120}}}' -f parsable ./releases/*"]
+}
+
+action "kube-lint" {
+  needs = ["yaml-lint"]
+  uses = "stefanprodan/gh-actions/kubeval@master"
+  args = "workloads/*"
+}
+
+action "helm-lint" {
+  needs = ["yaml-lint"]
+  uses = "stefanprodan/gh-actions/helm@master"
+  args = ["lint charts/*"]
+}

releases/mongodb.yaml

@@ -23,4 +23,4 @@ spec:
     securityContext:
       enabled: true
       fsGroup: 0
-      runAsUser: 0
+      runAsUser: 0

releases/redis-auth.yaml

@@ -7,4 +7,4 @@ metadata:
   name: redis-auth
   namespace: demo
 data:
-  values.yaml: cGFzc3dvcmQ6IGFkbWlu
+  values.yaml: cGFzc3dvcmQ6IGFkbWlu