feat: allow docker compose overrides

- use file override to handle multiple networks
- expose and map only required ports
- name containers differently
- add environment for chain variable
- dont expose ports in image
Signed-off-by: Lakshya Singh <lakshay.singh1108@gmail.com>

bitcoind/Dockerfile

@@ -121,8 +121,6 @@ RUN chmod +x /healthcheck.sh
 
 VOLUME ["${BITCOIN_DATA}"]
 
-EXPOSE 8332 8333 18332 18333 18444
-
 RUN mkdir -p "${BITCOIN_DATA}"
 RUN chown -R bitcoin:bitcoin "${BITCOIN_DATA}"