add docker image in GH packages

This adds a Docker image to the GitHub packages of this repository. The image contains Python 3.10, Azure CLI, ODBC driver and Microsoft MS SQL tools. The image can then be used when running CI/CD.

.github/Dockerfile

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+FROM python:3.10-bullseye
+
+# Setup dependencies for pyodbc
+RUN apt-get update && \
+    apt-get install -y unixodbc-dev unixodbc apt-transport-https curl lsb-release && \
+    rm -rf /var/lib/apt/lists/*
+
+# enable Microsoft package repo
+RUN curl -sL -o mspkgs.deb https://packages.microsoft.com/config/debian/10/packages-microsoft-prod.deb && \
+   dpkg -i mspkgs.deb && \
+   rm -rf mspkgs.deb
+
+# enable Azure CLI package repo
+RUN echo "deb [arch=amd64] https://packages.microsoft.com/repos/azure-cli/ $(lsb_release -cs) main" | tee /etc/apt/sources.list.d/azure-cli.list
+
+# install Microsoft packages
+ENV ACCEPT_EULA=Y
+RUN apt-get update && \
+   apt-get install -y --no-install-recommends \
+   azure-cli \
+   msodbcsql17 \
+   mssql-tools && \
+   rm -rf /var/lib/apt/lists/*
+
+# add sqlcmd to the path
+ENV PATH="$PATH:/opt/mssql-tools/bin"

.github/dependabot.yml

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+---
+version: 2
+updates:
+  - package-ecosystem: pip
+    directory: "/"
+    schedule:
+      interval: daily
+  - package-ecosystem: github-actions
+    directory: "/"
+    schedule:
+      interval: daily
+  - package-ecosystem: docker
+    directory: "/"
+    schedule:
+      interval: daily

.github/workflows/publish-docker.yml

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+---
+name: Publish Docker image for CI/CD
+on:
+  push:
+    tags:
+      - 'docker-*'
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v1.14.1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v3.7.0
+        with:
+          images: ghcr.io/${{ github.repository }}
+
+      - name: Build and push Docker images
+        uses: docker/build-push-action@v2.10.0
+        with:
+          context: "{{defaultContext}}:.github"
+          push: true
+          platforms: linux/amd64
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}