Remove goreleaser and fix helm packaging (#6)

Goreleaser was causing issues when helm chart action created releases
for packaged helm chart, this PR replaces goreleaser with a much simpler
build and push model, and returns packaged helm charts to normal.

helm/kubernetes-operator/secretvalues.yaml

@@ -0,0 +1,16 @@
+netbirdAPI:
+  key: "nbp_1TpgsCUaF2BU3NVZfaDrGpoY1jx2iT2g7rWj"
+
+operator:
+  image:
+    tag: "v0.1.0"
+
+ingress:
+  enabled: true
+  router:
+    enabled: true
+  policies:
+    default:
+      name: Kubernetes Default Policy
+      sourceGroups:
+      - All