Add GPU sharing solution on native Kubernetes (#1102)

* run hadolint with reviewdog

* add LINCENSE in Dockerfile

* run hadolint with reviewdog

* Reporter of reviewdog command is "github-pr-check"

* format Dockerfile

* ignore DL3007 in hadolint

* clean up old docker images

* Add GPU sharing solution on native Kubernetes

* nightly test mailer

ci/jenkins/Jenkinsfile

@@ -190,10 +190,10 @@ pipeline {
         }
     }
     post {
-        always {
+        unsuccessful {
             script {
                 boolean isNightlyTest = isTimeTriggeredBuild()
-                if (!currentBuild.resultIsBetterOrEqualTo('SUCCESS') && isNightlyTest) {
+                if (isNightlyTest) {
                     // Send an email only if the build status has changed from green/unstable to red
                     emailext subject: '$DEFAULT_SUBJECT',
                     body: '$DEFAULT_CONTENT',

ci/jenkins/pod/milvus-gpu-version-centos7-build-env-pod.yaml

@@ -26,7 +26,8 @@ spec:
       limits:
         memory: "12Gi"
         cpu: "6.0"
-        nvidia.com/gpu: 1
+        # nvidia.com/gpu: 1
+        aliyun.com/gpu-mem: 2 # GiB
       requests:
         memory: "8Gi"
         cpu: "4.0"

ci/jenkins/pod/milvus-gpu-version-ubuntu18.04-build-env-pod.yaml

@@ -25,7 +25,8 @@ spec:
       limits:
         memory: "12Gi"
         cpu: "6.0"
-        nvidia.com/gpu: 1
+        # nvidia.com/gpu: 1
+        aliyun.com/gpu-mem: 2 # GiB
       requests:
         memory: "8Gi"
         cpu: "4.0"