Add dockerfile and build infra

This commit adds a dockerfile and github actions to automatically build and publish the docker image. It also configures dependabot to check for updated base images.

Author: tibroc

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+- package-ecosystem: docker
+  directory: /
+  schedule:
+    interval: monthly

.github/workflows/publish-docker-image.yml

@@ -0,0 +1,36 @@
+name: Publish Docker image
+
+on:
+  push:
+
+jobs:
+  push_to_registries:
+    name: Push Docker image to multiple registries
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+
+      - name: Build and push Docker images
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -0,0 +1,10 @@
+FROM python:3.12-slim
+EXPOSE 8000
+
+COPY . /occameracontrol
+WORKDIR /occameracontrol
+
+RUN pip install --no-cache-dir -r /occameracontrol/requirements.txt
+
+USER nobody
+ENTRYPOINT [ "python",  "-m", "occameracontrol"]

README.md

@@ -61,3 +61,20 @@ agent_calendar_update_time{agent="test_agent"} 1.707571943100096e+09
 # TYPE camera_position gauge
 camera_position{camera="http://camera-2-panasonic.example.com"} 10.0
 ```
+
+## Docker
+
+We also provide a container image.
+A simple docker compose example would look like this
+
+```yaml
+---
+version: '3'
+services:
+  app:
+    image: ghcr.io/virtuos/opencast-camera-control:main
+    ports:
+      - '8000:8000'
+    volumes:
+      - './your_config.yml:/occameracontrol/config.yml'
+```