refactor: replace ports with expose in docker-compose for services

docker-compose.yml

@@ -10,8 +10,8 @@ services:
       DJANGO_ALLOWED_HOSTS: ${CIE_AUTH_ALLOWED_HOSTS:-*}
       DJANGO_TRUST_ANCHOR: ${DJANGO_TRUST_ANCHOR:-http://federation-authority:8000}
       LOAD_FIXTURE_ON_EMPTY_DB: ${FEDERATION_AUTHORITY_LOAD_FIXTURE_ON_EMPTY_DB:-true}
-    ports:
-      - "${FEDERATION_AUTHORITY_PORT:-8000}:8000"
+    expose:
+      - "8000"
     volumes:
       - ./federation_authority:/app/federation_authority
       - federation-authority-data:/app/federation_authority/db
@@ -29,8 +29,8 @@ services:
       DJANGO_TRUST_ANCHOR: ${DJANGO_TRUST_ANCHOR:-http://federation-authority:8000}
       DJANGO_PROVIDER_ISSUER: ${DJANGO_PROVIDER_ISSUER:-http://provider:8002/oidc/op}
       LOAD_FIXTURE_ON_EMPTY_DB: ${PROVIDER_LOAD_FIXTURE_ON_EMPTY_DB:-true}
-    ports:
-      - "${PROVIDER_PORT:-8002}:8002"
+    expose:
+      - "8002"
     volumes:
       - ./provider:/app/provider
       - provider-data:/app/provider/db
@@ -53,8 +53,8 @@ services:
       DJANGO_RP_SHARED_SECRET: ${DJANGO_RP_SHARED_SECRET:-change-me-for-local-dev}
       DJANGO_RP_DEFAULT_PROVIDER: ${DJANGO_RP_DEFAULT_PROVIDER:-http://provider:8002/oidc/op}
       LOAD_FIXTURE_ON_EMPTY_DB: ${RELYING_PARTY_LOAD_FIXTURE_ON_EMPTY_DB:-true}
-    ports:
-      - "${RELYING_PARTY_PORT:-8001}:8001"
+    expose:
+      - "8001"
     volumes:
       - ./relying_party:/app/relying_party
       - relying-party-data:/app/relying_party/db