ci: publish released MWS images to GHCR

.github/workflows/publish-container.yml

@@ -0,0 +1,88 @@
+name: Publish container image
+
+on:
+  pull_request:
+    paths:
+      - Dockerfile
+      - .github/workflows/publish-container.yml
+  release:
+    types:
+      - published
+  workflow_dispatch:
+    inputs:
+      mws_version:
+        description: Published @tiddlywiki/mws version to package
+        required: true
+        type: string
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build container image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: false
+
+  publish:
+    if: github.event_name == 'release' || github.event_name == 'workflow_dispatch'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Check out release source
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.release.tag_name || github.sha }}
+
+      - name: Resolve published MWS version
+        id: version
+        env:
+          INPUT_VERSION: ${{ inputs.mws_version }}
+          RELEASE_TAG: ${{ github.event.release.tag_name }}
+        run: |
+          version="${INPUT_VERSION:-${RELEASE_TAG#v}}"
+          test -n "$version"
+          test "$(npm view "@tiddlywiki/mws@$version" version)" = "$version"
+          echo "value=$version" >> "$GITHUB_OUTPUT"
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract container metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: type=raw,value=${{ steps.version.outputs.value }}
+
+      - name: Build and publish container image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          build-args: MWS_VERSION=${{ steps.version.outputs.value }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -1,15 +1,20 @@
 # Use Node.js 22 Alpine image
 FROM node:22-alpine
 
-# Set working directory
+# The data-folder format is independent from the MWS package version. This
+# matches create-package/files/package.json, which is the template used by
+# `npm init @tiddlywiki/mws`.
+ARG MWS_VERSION=0.2.4
 WORKDIR /data
+RUN echo '{"name":"@tiddlywiki/mws-instance","private":true,"version":"0.2.0","scripts":{"start":"mws listen --listener"}}' > package.json
 
-# Create instance package.json that references MWS
-RUN echo '{"name":"@tiddlywiki/mws-instance","private":true,"version":"0.1.0","scripts":{"start":"mws listen --listener"}}' > package.json
-
-# Install TiddlyWiki and MultiWikiServer from npm
-# Using --omit=dev to keep image smaller
-RUN npm install --save-exact tiddlywiki@latest @tiddlywiki/mws@latest
+# Install the published MWS package for the target container platform. The
+# build tools are only needed when a native dependency has no prebuilt binary.
+# The create script then downloads TiddlyWiki with `mws update-tiddlywiki`.
+RUN apk add --no-cache --virtual .build-deps python3 make g++ \
+    && npm install --save-exact "@tiddlywiki/mws@${MWS_VERSION}" \
+    && npm exec mws update-tiddlywiki \
+    && apk del .build-deps
 
 # Expose default MWS port
 EXPOSE 8080