Add Docker builds

.dockerignore

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+node_modules
+npm-debug.log

.gitea/workflows/docker-publish.yaml

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+name: Build & publish images
+
+on: [push]
+
+env:
+  REGISTRY: git.plantroon.com
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    container:
+      image: catthehacker/ubuntu:act-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@28218f9b04b4f3f62068d7b6ce6ca5b26e35336c
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.CR_PAT }}
+
+      - name: Extract Docker metadata
+        id: meta
+        uses: https://github.com/docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        with:
+          images: git.plantroon.com/aux/keyserver
+
+      - name: Build and push Docker image
+        id: build-and-push
+        uses: docker/build-push-action@ac9327eae2b366085ac7f6a2d02df8aa8ead720a
+        with:
+          context: .
+          push: true
+          labels: ${{ steps.meta.outputs.labels }}
+          tags: ${{ steps.meta.outputs.tags }}
+

Dockerfile

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+FROM node:16
+
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci --omit=dev
+COPY . .
+EXPOSE 3000
+
+CMD [ "node", "index.js" ]