Add a basic e2e test for CI

Signed-off-by: Wang Yan <wangyan@vmware.com>

tests/push.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+set +e
+
+TIMEOUT=5
+while [ $TIMEOUT -gt 0 ]; do
+    STATUS=$(curl --insecure -s -o /dev/null -w '%{http_code}' http://localhost:5001/debug/health)
+    echo $STATUS
+    if [ $STATUS -eq 200 ]; then
+		    break
+    fi
+    TIMEOUT=$(($TIMEOUT - 1))
+    sleep 5
+done
+
+if [ $TIMEOUT -eq 0 ]; then
+    echo "Distribution cannot be available within one minute."
+    exit 1
+fi
+
+set -e
+
+docker pull hello-world:latest
+docker tag hello-world:latest $1:5000/distribution/hello-world:latest
+docker push $1:5000/distribution/hello-world:latest
+docker pull $1:5000/distribution/hello-world:latest