Add dockerfile and enable Docs build

docs/Dockerfile

@@ -0,0 +1,22 @@
+FROM python:3-alpine
+
+COPY requirements.txt /requirements.txt
+
+ARG version=master
+ENV VERSION=$version
+
+RUN pip install -r /requirements.txt \
+ && apk add --no-cache nginx curl \
+ && mkdir /run/nginx
+
+COPY ./nginx.conf /etc/nginx/conf.d/default.conf
+COPY . /docs
+
+RUN mkdir -p /build/$VERSION \
+ && sphinx-build /docs /build/$VERSION
+
+EXPOSE 80/tcp
+
+CMD nginx -g "daemon off;"
+
+HEALTHCHECK CMD curl -f -L http://localhost/ || exit 1

docs/nginx.conf

@@ -0,0 +1,5 @@
+server {
+    listen 80;
+    listen [::]:80;
+    root /build;
+}

tests/build.yml

@@ -46,10 +46,9 @@ services:
     image: ${DOCKER_ORG:-mailu}/${DOCKER_PREFIX}none:${MAILU_VERSION:-local}
     build: ../core/none
 
-# Uncomment next section after docs Dockerfile creation.
-#  docs:
-#    image: ${DOCKER_ORG:-mailu}/${DOCKER_PREFIX}docs:${MAILU_VERSION:-local}
-#    build:
-#      context: ../docs
-#      args:
-#        version: ${MAILU_VERSION:-local}
+  docs:
+    image: ${DOCKER_ORG:-mailu}/${DOCKER_PREFIX}docs:${MAILU_VERSION:-local}
+    build:
+      context: ../docs
+      args:
+        version: ${MAILU_VERSION:-local}