Copy webapp files instead of linking them

Dockerfile

@@ -21,15 +21,13 @@ RUN cp /src/config.sample.json /src/webapp/config.json
 
 FROM nginxinc/nginx-unprivileged:${DEBIAN_VERSION} AS nginx
 
-COPY --from=builder /src/webapp /app
-
 # Override default nginx config. Templates in `/etc/nginx/templates` are passed
 # through `envsubst` by the nginx docker image entry point.
 COPY /docker/nginx-templates/* /etc/nginx/templates/
 
 USER root
-RUN rm -rf /usr/share/nginx/html \
-  && ln -s /app /usr/share/nginx/html
+RUN rm -rf /usr/share/nginx/html
+COPY --from=builder /src/webapp /usr/share/nginx/html
 
 # Run a no-op action of nginx to run entrypoint scripts that may tweak config files
 USER nginx