Replace copy of config files for docker at runtime

Reason: I might want to set database cleaner configs withouth rebuilding
the docker container. So, syncing the config/ folder would be desired.
But then we don't want the configuration for the host system to get in
conflict with the docker settings. Solution: Set node instance
environment variable to `docker`.

Author: roschaefer

Dockerfile

@@ -6,6 +6,9 @@ EXPOSE 3030
 # chrome debugging
 EXPOSE 9229
 
+# override configuration by instance name in docker container
+ENV NODE_APP_INSTANCE=docker
+
 # update unix packages
 RUN apk update && apk upgrade
 RUN rm -rf /var/cache/apk/*
@@ -22,8 +25,6 @@ RUN yarn install --frozen-lockfile --non-interactive
 
 # copy the code to the docker image
 COPY . /API
-# setup local configuration
-COPY ./config/docker/* /API/config/
 
 # start the application in a autohealing cluster
 # NOTE: quick fix for server issues, restart api when reaching max of 300 MB Memory Usage (happens in conjunction with 100% CPU Usage)

config/default-docker.json

@@ -0,0 +1,4 @@
+{
+  "mongodb": "mongodb://mongo:27017/hc_api",
+  "host": "0.0.0.0"
+}

config/docker/local-development.json

@@ -9,12 +9,9 @@ services:
     links:
       - mongo
       - maildev
-    environment:
-      - NODE_ENV=development
     command: yarn run dev
     volumes:
       - .:/API
-      - docker_config:/API/config
   mongo:
     image: mongo
     command: "--smallfiles --logpath=/dev/null"
@@ -23,5 +20,3 @@ services:
     ports:
       - "1080:80"
       - "1025:25"
-volumes:
-  docker_config: