Merge branch 'distroless' into 'main'

Add stable tag to nginx base image

See merge request frontend/user-guide!4

Dockerfile

@@ -8,7 +8,7 @@ WORKDIR /app
 COPY . /app
 RUN yarn && npx grunt
 
-FROM nginxinc/nginx-unprivileged as base
+FROM nginxinc/nginx-unprivileged:stable as base
 
 RUN mkdir -p /tmp/root/var/cache/nginx && \
     cp -a --parents /usr/lib/nginx \