updates to build container

Dockerfile

@@ -1,9 +1,21 @@
 
-FROM nginx
+ARG DOC_UTILS_VERSION
+ARG NGINX_VERSION
+
+FROM gitea.jbrumond.me/doc-utils/utils:${DOC_UTILS_VERSION} AS build_stage
+WORKDIR /workspace
+
+# build website from source files
+COPY docs layouts partials config.yaml metadata.json /workspace/
+RUN docs2website config.yaml
+
+
+
+FROM nginx:${NGINX_VERSION} AS deploy_stage
 EXPOSE 80
 
-# actual web content
-COPY www/ /usr/share/nginx/html
+# copy actual web content built above
+COPY --from=build_stage /workspace/www/ /usr/share/nginx/html
 RUN chmod -R +rX /usr/share/nginx/html
 
 # nginx config files