Create docker-image.yml (#15)

.github/workflows/docker-image.yml

@@ -0,0 +1,31 @@
+name: Docker Image for Gitlab Bot CI
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Buildx
+      uses: docker/setup-buildx-action@v1
+
+    - name: Login
+      uses: docker/login-action@v1
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_TOKEN }}
+
+    - name: Build and push
+      uses: docker/build-push-action@v2
+      with:
+        context: .
+        push: true
+        tags: goodideal/gitlab-bot:latest