docker image, github workflow

.dockerignore

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+.git/
+.github/
+venv/
+.env
+example-*
+test.conf

.github/dependabot.yml

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

.github/workflows/build-image.yml

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+name: Build Docker Image
+
+on:
+  push:
+    branches:
+      - master
+    paths-ignore:
+      - README.md
+  release:
+    types: [published]
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3.0.2
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4.0.1
+        with:
+          images: mkoetter/netbox-kea-subnets
+          tags: |
+            type=edge
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}},enable=${{ !startsWith(github.ref, 'refs/tags/v0.') }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v2 
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v3.1.1
+        with:
+          context: .
+          push: true
+          platforms: linux/amd64, linux/arm/v6, linux/arm/v7, linux/arm64/v8
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+
+      - name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}
+
+      - name: Docker Hub Description
+        uses: peter-evans/dockerhub-description@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          repository: mkoetter/netbox-kea-subnets
+          short-description: ${{ github.event.repository.description }}

Dockerfile

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+FROM python:3-alpine
+
+WORKDIR /usr/src/app
+
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+ENTRYPOINT [ "python", "./kea-subnets.py" ]

README.md

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 # Configure Kea DHCP Subnets using Netbox
 
+[![Build Docker Image](https://github.com/michaelkoetter/netbox-kea-subnets/actions/workflows/build-image.yml/badge.svg)](https://github.com/michaelkoetter/netbox-kea-subnets/actions/workflows/build-image.yml)
+[![image-version](https://img.shields.io/static/v1?logo=docker&label=Docker+Hub&message=mkoetter/netbox-kea-subnets&color=informational)](https://hub.docker.com/r/mkoetter/netbox-kea-subnets)
+
 This script fetches data from Netbox to create Kea subnet configuration from Prefixes, IP Ranges and IP Addresses.
 
 A Jinja2 template is used to render each subnet. It can be customized to add additional data, e.g. from Netbox custom fields (see example in `templates`).
 
-## Installation
+## Docker Images
+
+Docker Images are automatically built for new releases.
+
+```bash
+docker run --rm mkoetter/netbox-kea-subnets:latest --help
+```
+
+## Development
 
 ```bash
 python3 -m venv venv/