correct entry script bug and allow config from env file

- A bug in `entry` caused the script to not change into the directory correctly.
This was corrected by marking the script as bash rather than sh.
- `install.sh` now stops a running service before updating
- `docker-compose.yml` now assigns a consistent container name for the app
- `docker-compose.yml` now uses environment variables or a `.env` file to
  assign container name and port mappings if available
- updated readme file with better instructions

install.sh

@@ -21,6 +21,15 @@ if [ "$EUID" -ne 0 ]
   exit 1
 fi
 
+
+# stop any running systemd service if not running in a docker environment
+if [ -f /.dockerenv ]; then
+  echo "Docker environment detected - skipping systemd installation"
+else
+  echo "stopping system service"
+  systemctl stop streamline-emr
+fi
+
 set -e
 
 # copy root files
@@ -33,9 +42,8 @@ for f in $(find $LOCATION/images -name "*.img");do
   docker load -i $f
 done
 
-if [ -f /.dockerenv ]; then
-  echo "Docker environment detected - skipping systemd installation"
-else
+# install systemd service unless running in a docker environment
+if [ ! -f /.dockerenv ]; then
   echo "installing system service"
   systemctl daemon-reload
   systemctl enable streamline-emr