add workflow to publish container

Author: ddalcino

.github/workflows/publish-dockerfile.yml

@@ -0,0 +1,40 @@
+name: CI/CD
+on:
+  push:
+    paths:
+      - docker
+  pull_request:
+    paths:
+      - docker
+  workflow_dispatch:
+
+
+jobs:
+  build:
+    name: Build and publish container
+    runs-on: ubuntu-latest
+    env:
+      IMAGE_NAME: cpp
+      VERSION: 0.1.0
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.PAT }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: ${{ github.ref == 'refs/heads/main' }}
+          tags: |
+            ghcr.io/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}:latest
+            ghcr.io/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}:${{ env.VERSION }}