Add /home/supserset as config location

Dockerfile

@@ -6,7 +6,7 @@ ARG SUPERSET_VERSION=0.22.1
 # Configure environment
 ENV LANG=C.UTF-8 \
     LC_ALL=C.UTF-8 \
-    PYTHONPATH=/etc/superset:$PYTHONPATH \
+    PYTHONPATH=/etc/superset:/home/superset:$PYTHONPATH \
     SUPERSET_VERSION=${SUPERSET_VERSION} \
     SUPERSET_HOME=/var/lib/superset
 
@@ -45,7 +45,8 @@ RUN useradd -U -m superset && \
 
 # Configure Filesystem
 COPY superset /usr/local/bin
-VOLUME /etc/superset \
+VOLUME /home/superset \
+       /etc/superset \
        /var/lib/superset
 WORKDIR /home/superset
 

README.md

@@ -24,7 +24,7 @@ View the contents of the [`examples`](./examples) directory to see some simple `
 
 The image defines two data volumes: one for mounting configuration into the container, and one for data (logs, SQLite DBs, &c).
 
-The configuration volume is located at `/etc/superset`. This directory is included in the `PYTHONPATH` of the image. Mount any configuration (specifically the `superset_config.py` file) here.
+The configuration volume is located alternatively at `/etc/superset` or `/home/superset`; either is acceptable. Both of these directories are included in the `PYTHONPATH` of the image. Mount any configuration (specifically the `superset_config.py` file) here to have it read by the app on startup.
 
 The data volume is located at `/var/lib/superset` and it is where you would mount your SQLite file (if you are using that as your backend), or a volume to collect any logs that are routed there. This location is used as the value of the `SUPERSET_HOME` environmental variable.