Add GH workflow for docker build and push (#186)

.github/workflows/docker-build.yml

@@ -0,0 +1,33 @@
+name: Build+Push Daemon/Admin Docker Image
+
+on:
+  push:
+    branches: [ "master" ]
+
+jobs:
+  build_and_push:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Build Docker image
+      run: docker build --no-cache --tag vtnerd/monero-lws:master .
+    - name: Add additional tags
+      run: docker image tag vtnerd/monero-lws:master ghcr.io/vtnerd/monero-lws:master
+
+    - name: Login to GitHub Container Registry
+      uses: docker/login-action@v3
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+    - name: Push to GitHub Container Registry
+      run: docker push -a ghcr.io/vtnerd/monero-lws
+
+    - name: Login to Docker.io
+      uses: docker/login-action@v3
+      with:
+        username: ${{ github.actor }}
+        password: ${{ secrets.DOCKER_VTNERD_TOKEN }}
+    - name: Push to Docker.io
+      run: docker push -a vtnerd/monero-lws