Rename main.yml to docker.yml

.github/workflows/docker.yml

@@ -0,0 +1,14 @@
+name: Docker Image CI
+on:
+  push:
+    branches: [ master ]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build the Docker image
+      run: |
+        echo "${{ secrets.DOCKER_HUB_TOKEN }}" | docker login -u "${{ secrets.DOCKER_HUB_USERNAME }}" --password-stdin docker.io
+        docker build . --file Dockerfile --tag docker.io/${{ secrets.DOCKER_HUB_USERNAME }}/${{ secrets.DOCKER_HUB_REPOSITORY }}:latest
+        docker push docker.io/${{ secrets.DOCKER_HUB_USERNAME }}/${{ secrets.DOCKER_HUB_REPOSITORY }}:latest