Fix LNbits .env creation

use .env.example from LNbits package as .env template

rootfs/standard/usr/bin/service_scripts/pre_lnbits.sh

@@ -1,23 +1,28 @@
 #!/bin/bash
 
 set -x
+source /usr/share/mynode/mynode_app_versions.sh
 
-# Copy config file
-if [ ! -f /mnt/hdd/mynode/lnbits/.env ]; then
-    cp /usr/share/mynode/lnbits.env /mnt/hdd/mynode/lnbits/.env
+# Delete old myNode .env file created before 0.12.x
+if [ -f /usr/share/mynode/lnbits.env ]; then
+    rm -f /usr/share/mynode/lnbits.env
+fi
+
+# if current LNbits version config is missign create .env from .env.example 
+if [ ! -f /mnt/hdd/mynode/lnbits/update_config_$LNBITS_VERSION ]; then
+    rm -f /mnt/hdd/mynode/lnbits/update_config_*
+    touch /mnt/hdd/mynode/lnbits/update_config_$LNBITS_VERSION
+
+    cp -f /opt/mynode/lnbits/.env.example /mnt/hdd/mynode/lnbits/.env
     chown bitcoin:bitcoin /mnt/hdd/mynode/lnbits/.env
+
+# Use ADMIN_UI 
+	sed -i "s|^LNBITS_ADMIN_UI=.*|LNBITS_ADMIN_UI=true|g" /mnt/hdd/mynode/lnbits/.env
+
+# Update env file with files mapped in lnbits.service
+	sed -i "s|^LND_REST_CERT=.*|LND_REST_CERT=\"/app/tls.cert\"|g" /mnt/hdd/mynode/lnbits/.env
+	sed -i "s|^LND_REST_MACAROON=.*|LND_REST_MACAROON=\"/app/admin.macaroon\"|g" /mnt/hdd/mynode/lnbits/.env
 fi
 
-# Force update of LNBits config file (increment to force new update)
-# LNBITS_CONFIG_UPDATE_NUM=1
-# if [ ! -f /mnt/hdd/mynode/lnbits/update_config_$LNBITS_CONFIG_UPDATE_NUM ]; then
-#     cp -f /usr/share/mynode/lnbits.env /mnt/hdd/mynode/lnbits/.env
-#     chown bitcoin:bitcoin /mnt/hdd/mynode/lnbits/.env
-#     touch /mnt/hdd/mynode/lnbits/update_config_$LNBITS_CONFIG_UPDATE_NUM
-# fi
 
-# Generate hex macaroons
-#macaroonAdminHex=$(xxd -ps -u -c 1000 /mnt/hdd/mynode/lnd/data/chain/bitcoin/mainnet/admin.macaroon)
 
-# Update env file
-sed -i "s|^LND_REST_MACAROON=.*|LND_REST_MACAROON=\"/app/admin.macaroon\"|g" /mnt/hdd/mynode/lnbits/.env