experimental alpine support for diagram feature (sometimes hangs?)

Dockerfile.alpine

@@ -1,4 +1,4 @@
-FROM pandoc/extra:latest
+FROM pandoc/extra:latest AS stage-base
 
 RUN set -ex; \
     \
@@ -20,3 +20,29 @@ COPY src/usr /usr
 WORKDIR /docs
 ENTRYPOINT ["autodoc"]
 CMD ["-bw"]
+
+FROM stage-base AS stage-diagram
+
+ENV PUPPETEER_CACHE_DIR="/usr/local/share/puppeteer/cache" \
+    PUPPETEER_EXECUTABLE_PATH="/usr/bin/chromium-browser" \
+    PUPPETEER_SKIP_CHROMIUM_DOWNLOAD="true"
+
+COPY src/diagram.lua.patch /usr/local/src/autodoc/diagram.lua.patch
+
+RUN set -ex; \
+    \
+    apk add --no-cache \
+      chromium \
+      npm \
+      patch \
+    ; \
+    \
+    npm install --global @mermaid-js/mermaid-cli; \
+    # rm -rf /root/.cache/puppeteer; \
+    \
+    wget \
+      --output-document='/usr/local/share/pandoc/filters/diagram.lua' \
+      'https://raw.githubusercontent.com/pandoc-ext/diagram/refs/heads/main/_extensions/diagram/diagram.lua' \
+    ; \
+    patch /usr/local/share/pandoc/filters/diagram.lua < /usr/local/src/autodoc/diagram.lua.patch; \
+    rm /usr/local/src/autodoc/diagram.lua.patch;