Add docker + builder

.dockerignore

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+# Ignore git metadata folder
+.git/
+.github/
+
+# Ignore docker related files
+Dockerfile*
+docker-compose.*
+.dockerignore
+.gitignore

.editorconfig

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+# EditorConfig is awesome: https://EditorConfig.org
+
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+trim_trailing_whitespace = true
+insert_final_newline = true
+end_of_line = lf
+indent_size = 2

.github/dependabot.yml

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

.github/workflows/ci.yml

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+name: ci
+
+on:
+  push:
+    branches:
+      - '**'
+      - '!dependabot/**'
+    tags:
+      - 'v*.*.*'
+  pull_request:
+    branches:
+      - 'master'
+      - 'main'
+      - 'gh-pages'
+  schedule:
+    - cron: '25 3 */7 * *'
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-{{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ghcr.io/${{ github.repository }}
+          tags: |
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: Dockerfile
+          platforms: linux/amd64,linux/arm64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

Dockerfile

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+FROM docker.io/debian:12 AS build
+
+COPY . /app/_site
+
+RUN find /app/_site/ -type f \( -name "*.html" -o -name "*.css" -o -name "*.js" -o -name "*.xml" -o -name "*.json" -o -name "*.svg" \) -print0 | xargs -0 -P4 gzip -9k
+
+# https://github.com/nginxinc/docker-nginx-unprivileged
+FROM ghcr.io/nginxinc/nginx-unprivileged:stable-alpine AS webserver
+
+RUN echo "absolute_redirect off;" >/etc/nginx/conf.d/no-absolute_redirect.conf
+RUN echo "gzip_static on; gzip_proxied any;" >/etc/nginx/conf.d/gzip_static.conf
+# brotli_static not yet available in standard nginx distribution
+# RUN echo "brotli_static on; brotli_proxied any;" >/etc/nginx/conf.d/brotli_static.conf
+
+# Copy built site from build stage
+COPY --from=build /app/_site /usr/share/nginx/html
+
+# Test configuration during docker build
+RUN nginx -t
+
+# Port the container will listen on
+EXPOSE 8080