chore: Add P2P to the docker example (#140)

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Author: akandic47

deploy/mpc-node/.env.template

@@ -1,3 +1,4 @@
 SIGNING_IMAGE_VERSION=
 SERVICE_NAME=
-HOST_PORT=3000
+API_PORT=3000
+P2P_PORT=9000

deploy/mpc-node/docker-compose.yml

@@ -9,5 +9,6 @@ services:
       logging_jobname: "containerlogs"
       service_name: "${SERVICE_NAME}"
     ports:
-      - "${HOST_PORT:-3000}:3000"
+      - "${API_PORT:-3000}:3000"
+      - "${P2P_PORT:-9000}:9000"
     restart: always