Increase kubernetes versions test matrix for smoke tests

This allows us to test this branch with multiple kubernetes
versions.

.github/workflows/smoke-tests.yml

@@ -17,6 +17,12 @@ on:
 jobs:
   deploy-manifests:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        kubernetes-version:
+          - 1.17
+          - 1.18
+          - 1.19
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -35,7 +41,7 @@ jobs:
       - name: Create 5 node kind cluster
         uses: helm/kind-action@master
         with:
-          config: .github/kind-cluster.yaml
+          config: .github/kind-cluster-${{ matrix.kubernetes-version}}.yaml
 
       - name: Deploy kured on default namespace with its helm chart
         run: |