Fixed 404 on subpaths.

Author: pantierra

Dockerfile

@@ -5,11 +5,12 @@ FROM node:slim
 ARG APP_TITLE="STAC Manager"
 ARG APP_DESCRIPTION="A web application for managing STAC catalogs"
 ARG REACT_APP_STAC_API="https://earth-search.aws.element84.com/v0"
+ARG PUBLIC_URL="http://127.0.0.1:8080"
 
 ENV APP_TITLE=${APP_TITLE}
 ENV APP_DESCRIPTION=${APP_DESCRIPTION}
 ENV REACT_APP_STAC_API=${REACT_APP_STAC_API}
-ENV PUBLIC_URL="http://127.0.0.1:8080"
+ENV PUBLIC_URL=${PUBLIC_URL}
 
 # Set the working directory
 WORKDIR /app
@@ -25,6 +26,7 @@ RUN npm i -g http-server
 # Create a start script that respects runtime environment variables
 RUN echo '#!/bin/sh\n\
 npm run all:build\n\
+cp packages/client/dist/index.html packages/client/dist/404.html\n\
 http-server -p 80 packages/client/dist' > /app/start.sh
 
 RUN chmod +x /app/start.sh