Add Github action CI integration test (#2)

Signed-off-by: JenTing Hsiao <[email protected]>

.github/workflows/ci.yml

@@ -0,0 +1,49 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  integration-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Go ^1.15
+        uses: actions/setup-go@v2
+        with:
+          go-version: ^1.15
+
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v2
+
+      - name: Set up KIND cluster
+        uses: engineerd/[email protected]
+
+      - name: Install kustomize
+        run: |
+          curl -s "https://raw.githubusercontent.com/kubernetes-sigs/kustomize/master/hack/install_kustomize.sh" | bash
+          sudo mv kustomize /usr/local/bin/kustomize
+
+      - name: Install
+        run: |
+          git clone -b v0.4.1 https://github.com/kubernetes-sigs/metrics-server.git
+          mkdir -p metrics-server/manifests/secure-metrics-server
+          cp secure-metrics-server.sh metrics-server/manifests/secure-metrics-server
+          cd metrics-server/manifests/secure-metrics-server
+          NODE_NAME=`kind get nodes`
+          CONTAINER_ID=`docker ps --filter "name=$NODE_NAME" -q`
+          docker cp $CONTAINER_ID:/etc/kubernetes/pki/ca.crt kubernetes-ca.crt
+          ./secure-metrics-server.sh
+          cd ../
+          kustomize build secure-metrics-server | kubectl apply -f -
+          kubectl wait --for=condition=available deploy/metrics-server -n kube-system
+
+      - name: Test
+        run: |
+          kubectl wait --for=condition=available apiservice/v1beta1.metrics.k8s.io
+          kubectl get --raw /apis/metrics.k8s.io/v1beta1/nodes
+          kubectl get --raw /apis/metrics.k8s.io/v1beta1/pods
+          kubectl top nodes
+          kubectl top pods -n kube-system