fix(integrations): publish the local stack on loopback only

Every consumer targets 127.0.0.1, so binding on 0.0.0.0 only exposed
the dev node and the insecure-credential indexer to the LAN.

Author: 0xisk

tests/integrations/local-env.yml

@@ -7,7 +7,7 @@ services:
     image: 'midnightntwrk/proof-server:8.0.3'
     command: ['midnight-proof-server -v']
     ports:
-      - '6300:6300'
+      - '127.0.0.1:6300:6300'
     environment:
       RUST_BACKTRACE: 'full'
     # The image ships no curl, so `make env-up` polls /version from the host.
@@ -18,7 +18,7 @@ services:
     # Pinned for the same reason as proof-server above.
     image: 'midnightntwrk/indexer-standalone:4.0.1'
     ports:
-      - '8088:8088'
+      - '127.0.0.1:8088:8088'
     environment:
       RUST_LOG: 'indexer=info,chain_indexer=info,indexer_api=info,wallet_indexer=info,indexer_common=info,info'
       APP__INFRA__NODE__URL: 'ws://node:9944'
@@ -45,7 +45,7 @@ services:
   node:
     image: 'midnightntwrk/midnight-node:0.22.2'
     ports:
-      - '9944:9944'
+      - '127.0.0.1:9944:9944'
     healthcheck:
       test: ['CMD', 'curl', '-f', 'http://localhost:9944/health']
       interval: 2s