Add Dockerfile and CI workflow for building and publishing Docker image: Set up a Dockerfile for Hugo builds with necessary dependencies and create a GitHub Actions workflow to automate the build and push process to the GitHub Container Registry.

Author: markgoho

.github/workflows/docker-image.yml

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+# .github/workflows/docker-image.yml
+name: Build and Publish Docker Image
+
+on:
+  push:
+    branches:
+      - trunk
+    paths:
+      - "Dockerfile"
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to the GitHub 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 image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

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+# Dockerfile for Doula Cooperative Hugo builds
+# Start from a stable, minimal base image
+FROM ubuntu:22.04
+
+# Avoid prompts from apt
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Set versions for our tools as arguments
+ARG HUGO_VERSION=0.128.2
+ARG DART_SASS_VERSION=1.77.8
+
+# 1. Install base dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    curl \
+    wget \
+    ca-certificates \
+    unzip \
+    && rm -rf /var/lib/apt/lists/*
+
+# 2. Install Bun
+RUN curl -fsSL https://bun.sh/install | bash
+ENV PATH="/root/.bun/bin:$PATH"
+
+# 3. Install Hugo (Extended Version)
+RUN wget "https://github.com/gohugoio/hugo/releases/download/v${HUGO_VERSION}/hugo_extended_${HUGO_VERSION}_linux-amd64.deb" \
+    && apt-get install -y ./hugo_extended_${HUGO_VERSION}_linux-amd64.deb \
+    && rm hugo_extended_${HUGO_VERSION}_linux-amd64.deb
+
+# 4. Install Dart Sass
+RUN wget "https://github.com/sass/dart-sass/releases/download/${DART_SASS_VERSION}/dart-sass-${DART_SASS_VERSION}-linux-x64.tar.gz" \
+    && tar -xzf "dart-sass-${DART_SASS_VERSION}-linux-x64.tar.gz" \
+    && mv dart-sass /usr/local/share/ \
+    && ln -s /usr/local/share/dart-sass/sass /usr/local/bin/sass \
+    && rm "dart-sass-${DART_SASS_VERSION}-linux-x64.tar.gz"
+
+# 5. Verify installations
+RUN echo "Bun version: $(bun --version)"
+RUN echo "Hugo version: $(hugo version)"
+RUN echo "Sass version: $(sass --version)"
+
+# Set the working directory for when the container starts
+WORKDIR /workspace