Switch from entrypoint to cmd to allow overriding (#249)

- Add a script that copies an environment variable `SETTINGS` to the `settings.env.json` file for use as appsettings
- Update Dockerfile to include the script above
- Change the permissions of the `config` directory so that the startup script can write the `settings.env.json` file

Dockerfile

@@ -21,14 +21,21 @@ RUN $(npm bin)/ng build --configuration production
 
 FROM nginxinc/nginx-unprivileged:stable-alpine
 
+# Clear all original files
 USER root
 RUN rm -rf /usr/share/nginx/html/*
 USER nginx
 
 COPY default.conf /etc/nginx/conf.d/default.conf
-COPY nginx-basehref.sh /docker-entrypoint.d/90-basehref.sh
+COPY scripts/settings-from-env.sh /usr/local/bin
+COPY scripts/nginx-basehref.sh /docker-entrypoint.d/90-basehref.sh
 COPY --from=builder /ng-app/dist /usr/share/nginx/html
 
+USER root
+RUN chmod 755 /usr/local/bin/settings-from-env.sh && \
+    chown nginx:nginx /usr/share/nginx/html/assets/config
+USER nginx
+
 EXPOSE 8080
 
-ENTRYPOINT ["nginx", "-g", "daemon off;"]
+CMD ["nginx", "-g", "daemon off;"]

scripts/settings-from-env.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+set -e
+echo $SETTINGS > /usr/share/nginx/html/assets/config/settings.env.json
+nginx -g "daemon off;"