server: docker installer - source .env.default if no installed .env available

server/install/install.sh

@@ -47,6 +47,8 @@ git submodule update
 
 if [[ -f "$INSTALL_DIR/.env" ]]; then
   export $(cat "$INSTALL_DIR/.env" | xargs)
+else 
+  export $(cat ".env.default" | xargs)
 fi
 
 if [[ ! -d "$PWD/$DATA_DIR" ]]; then