mod: add release workflow (#126)

.github/workflows/Http-Gateway-Release.yml

@@ -1,8 +1,8 @@
 name: Http-Gateway-Release
 on:
-  push:
-    branches:
-      - master
+  release:
+    types:
+      - published
 jobs:
   release-image:
     runs-on: ubuntu-latest
@@ -30,4 +30,4 @@ jobs:
         context: .
         file: ./Dockerfile
         push: true
-        tags: vesoft/nebula-http-gateway:nightly
+        tags: vesoft/nebula-http-gateway:3.2.0

.github/workflows/Http-Gateway-nightly.yml

@@ -0,0 +1,33 @@
+name: Http-Gateway-nightly
+on:
+  push:
+    branches:
+      - master
+jobs:
+  release-image:
+    runs-on: ubuntu-latest
+    steps:
+    -
+      name: Checkout Github Action
+      uses: actions/checkout@master
+
+    -
+      name: Set up QEMU
+      uses: docker/setup-qemu-action@v1
+    -
+      name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v1
+    -
+      name: Login to DockerHub
+      uses: docker/login-action@v1 
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+    -
+      name: Build and push
+      uses: docker/build-push-action@v2
+      with:
+        context: .
+        file: ./Dockerfile
+        push: true
+        tags: vesoft/nebula-http-gateway:nightly