Initial commit - GitHub action to publish docker image on GHCR

.github/workflows/docker_ghcr.yaml

@@ -0,0 +1,28 @@
+name: "Publish Docker image"
+# Name of this action (else will name after the commits)
+run-name: Publish Docker image on GitHub container registry (ghcr.io)
+
+# Source: https://dev.to/github/publishing-a-docker-image-to-githubs-container-repository-4n50
+
+on: [push]
+
+jobs:
+  Publish-docker-image:
+    runs-on: ubuntu-latest
+    name: Publish docker image
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build the Docker image
+        run: |
+          docker build . --tag ghcr.io/pythonhealthdatascience/covid19:latest
+          docker push ghcr.io/pythonhealthdatascience/covid19:latest