provide possibility to locally build website with all required steps

Dockerfile

@@ -2,11 +2,54 @@
 #
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-FROM bitnami/apache:2.4
+# =============================================================================
+# Configure webserver
+# =============================================================================
 
-COPY site/public/ /app/
+FROM bitnami/apache:2.4 as webserver-prep
 
 COPY reuse.software.conf /vhosts/
 
 ## Enable mod_expires module
 RUN sed -i -r 's/#LoadModule expires_module/LoadModule expires_module/' /opt/bitnami/apache/conf/httpd.conf
+
+
+# =============================================================================
+# Production (use the site built in hugo step in .drone.yml)
+# =============================================================================
+
+FROM webserver-prep as production
+
+COPY site/public/ /app/
+
+
+# =============================================================================
+# Development Preparation: run sync-docs, po4a and hugo
+# =============================================================================
+
+FROM alpine:3 as dev-prep
+
+# Dependencies
+RUN apk --no-cache add bash perl-yaml-tiny po4a hugo
+
+COPY . /app
+
+WORKDIR /app/
+
+# sync and translate docs (from their own po files)
+RUN bash sync-docs.sh
+
+# Run po4a for reuse-website po strings
+RUN cd site/ && po4a po/po4a.conf
+
+# Build hugo
+RUN hugo -s site
+
+
+# =============================================================================
+# Production (use the site built in dev-prep)
+# =============================================================================
+
+FROM webserver-prep as development
+
+COPY --from=dev-prep /app/site/public/ /app/

docker-compose.dev.yml

@@ -0,0 +1,29 @@
+# SPDX-FileCopyrightText: Free Software Foundation Europe e.V.
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# =============================================================================
+# sync docs, translate, and build hugo in Docker container
+# =============================================================================
+
+version: "3"
+services:
+  reuse-web:
+    container_name: reuse-web
+    build:
+      context: .
+      target: development
+    image: reuse-web
+    restart: always
+    logging:
+      driver: json-file
+      options:
+        max-size: "5m"
+        max-file: "5"
+    # Reverse Proxy
+    labels:
+      proxy.host: "reuse.software"
+      proxy.host_alias: "www.reuse.software"
+      proxy.port: "6140"
+    ports:
+      - "6140:8080"

docker-compose.yml

@@ -6,7 +6,9 @@ version: "3"
 services:
   reuse-web:
     container_name: reuse-web
-    build: .
+    build:
+      context: .
+      target: production
     image: reuse-web
     restart: always
     logging: