Add github actions docker

Author: ubaumann

.github/workflows/docker-image.yml

@@ -0,0 +1,35 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+
+  build:
+    environment: docker-build
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    
+    - name: Login to Docker Hub
+      uses: docker/login-action@v1
+      with:
+        username: ${{ secrets.DOCKER_HUB_USERNAME }}
+        password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+    
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v1
+    
+    - name: Build and push
+      uses: docker/build-push-action@v2
+      with:
+        context: ./
+        file: ./Dockerfile
+        builder: ${{ steps.buildx.outputs.name }}
+        push: true
+        tags: ${{ secrets.DOCKER_HUB_USERNAME }}/textfsm101:latest
+        cache-from: type=registry,ref=${{ secrets.DOCKER_HUB_USERNAME }}/textfsm101:buildcache
+        cache-to: type=registry,ref=${{ secrets.DOCKER_HUB_USERNAME }}/textfsm101:buildcache,mode=max