feat: update scripts to use env vars

- bitcoind entrypoint set chain value
- bitcoind healthcheck fix cli parameter
- lightning entrypoint script
- lightning health script
- prepend chain in bitcoin.conf

Signed-off-by: Lakshya Singh <lakshay.singh1108@gmail.com>

docker-compose.yml

@@ -22,7 +22,7 @@ services:
     image: lightningd
     container_name: lightningd-test
     command:
-      - --conf=/home/lightning/.lightning/test-config
+      - --conf=/home/lightning/.lightning/testnet-config
       - --bitcoin-rpcconnect=bitcoind
     volumes:
       - clightning:/home/lightning/.lightning
@@ -35,7 +35,7 @@ services:
         condition: service_healthy
         restart: true
     env_file:
-      - ./assets/test-env
+      - ./assets/testnet-env
     environment:
       - BITCOIN_CHAIN=test