Simplify manifest testing

We don't need to test with kustomize, manifest testing is good
enough, as we just test that the manifest are correct, not that
they are functional (which would require a change in the poll time).

.github/workflows/manifests-tests.yml

@@ -1,8 +1,10 @@
-#This tests if our kustomize manifests still work with an update
-#of kustomize or with an update of our manifests (keeping the image
-# the same).
+#This:
+#- Periodically ensures our latest releases manifest deploy correctly
+#- Ensures that a PR changing any of the manifests (later used for
+#  producing a release) will not break a deployment of an existing release
+#  (so we can assume it will not break a new release either)
 
-name: Kustomize deploy
+name: Manifest deploy
 
 on:
   pull_request:
@@ -12,7 +14,7 @@ on:
     - cron: '0 0 1 * *'
 
 jobs:
-  deploy-with-kustomize:
+  use-manifests:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -26,14 +28,14 @@ jobs:
       - name: Create a default kind cluster
         uses: helm/kind-action@master
 
-      # Kustomize won't work with symlinks to resources outside its folder
       # kind-action already installed kind and kubectl.
-      - name: Deploy with kubectl using kustomization
+      # Hard code DH_ORG weaveworks so that all forks point to latest image
+      # from weaveworks.
+      - name: Deploy with kubectl
         run: |
-          cp kured-{ds,rbac}.yaml .github/kustomize/
           VERSION=$(curl -s https://api.github.com/repos/weaveworks/kured/releases | jq -r .[0].tag_name)
-          sed -i "s#docker.io/weaveworks/kured#docker.io/weaveworks/kured:$VERSION#g" .github/kustomize/kured-dev.yaml
-          kubectl apply -k .github/kustomize/
+          make DH_ORG=weaveworks VERSION=$VERSION manifest
+          kubectl apply -f kured-{rbac,ds}.yaml
 
       - name: Show kured is deploying
         run: |