Add initial e2e tests

test/prometheus-manifests/service-monitor-kubelet.yaml

@@ -0,0 +1,25 @@
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  labels:
+    app.kubernetes.io/name: kubelet
+  name: kubelet
+  namespace: prometheus-adapter-e2e
+spec:
+  endpoints:
+  - bearerTokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token
+    honorLabels: true
+    honorTimestamps: false
+    interval: 10s
+    path: /metrics/resource
+    port: https-metrics
+    scheme: https
+    tlsConfig:
+      insecureSkipVerify: true
+  jobLabel: app.kubernetes.io/name
+  namespaceSelector:
+    matchNames:
+    - kube-system
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: kubelet