Create the dockerfle and git action command

Author: seunAdeks

.github/workflows/publish-docker.yml

@@ -0,0 +1,40 @@
+name: Publish Docker image
+# To maastrichtu-library GitHub Container Registry
+# https://github.com/orgs/maastrichtu-library/packages 
+on:
+  workflow_dispatch:
+  push:
+    branches: [ main ]
+    paths:
+    - 'Dockerfile'
+    - '.github/workflows/publish-docker.yml'
+  schedule:
+    - cron: '0 3 * * 1'
+    # Monday at 3:00 GMT+1
+
+env:
+  IMAGE_PULLED: postgres:latest
+  IMAGE_PUSHED: ghcr.io/maastrichtu-library/postgres:latest
+
+jobs:
+  publish-latest:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Log into GitHub Container Registry
+      # TODO: Create a token with `read:packages` and `write:packages` scopes 
+      # And save it as an Actions secret CONTAINER_REGISTRY_GITHUB_TOKEN
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
+
+      - name: Pull image from DockerHub
+        run: docker pull $IMAGE_PULLED
+
+      - name: Push image to GitHub Container Registry
+        run: |
+          docker tag $IMAGE_PULLED $IMAGE_PUSHED
+          docker push $IMAGE_PUSHED
+
+      # - name: Build image
+      #   run: docker build . --file Dockerfile --tag $IMAGE_PUSHED

Dockerfile

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+FROM postgres:latest
+
+LABEL org.opencontainers.image.source https://github.com/maastrichtu-library/postgres
+
+# RUN apt-get update   

README.md

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-# postgres
+# postgres
+**Postgres** image mirror from https://hub.docker.com/_/postgres
+
+cf. Github repository: https://github.com/docker-library/docs/tree/master/postgres
+
+Hosted on [GitHub Container Registry](https://github.com/MaastrichtU-Library/postgres) ([ghcr.io](https://ghcr.io)) to avoid DockerHub pull limitations, and easily deploy on clusters (such as Kubernetes).
+
+
+## Automatically updated
+
+[![Publish Docker image](https://github.com/MaastrichtU-Library/postgres/workflows/Publish%20Docker%20image/badge.svg)](https://github.com/MaastrichtU-Library/postgres/actions)
+
+# The image on [ghcr.io](https://ghcr.io) is automatically updated every week (Monday at 3:00 GMT+1) by a GitHub Actions workflow to match the `latest` tag of [cellprofiler](https://hub.docker.com/_/cellprofiler) 
+
+## Run
+
+```bash
+docker run -it -v $(pwd):/root ghcr.io/maastrichtu-library/postgres:latest
+```
+
+In the container:
+
+* User, with `sudo` privileges: `root`
+* Workspace path: `/root`
+
+Set entrypoint to `tail -f /dev/null` to keep it hanging as a service.
+
+```bash
+docker run -it --entrypoint tail -v $(pwd):/root ghcr.io/maastrichtu-library/postgres:latest -f /dev/null
+```
+
+## Build
+
+Feel free to edit the `Dockerfile` to install additional packages in the image.
+
+```bash
+docker build -t ghcr.io/maastrichtu-library/postgres:latest .
+```
+
+## Push
+
+```bash
+docker push ghcr.io/maastrichtu-library/postgres:latest
+```
+