Add COINDATA_PATH to .env

Dockerfile

@@ -1,6 +1,6 @@
 FROM ubuntu:18.10
 
-ENV LANG C.UTF-8 \
+ENV LANG=C.UTF-8 \
     PARTICL_DATADIR="/coindata/particl" \
     PARTICL_BINDIR="/opt/particl" \
     LITECOIN_BINDIR="/opt/litecoin" \

docker/.env

@@ -1 +1,2 @@
 HTML_PORT=127.0.0.1:12700:12700
+COINDATA_PATH=./coindata

docker/docker-compose.yml

@@ -6,7 +6,7 @@ services:
         build:
             context: ../
         volumes:
-            - ./coindata:/coindata
+            - ${COINDATA_PATH}:/coindata
         ports:
             - "${HTML_PORT}"  # Expose only to localhost, see .env