fix: lower default gateway heap for e2-micro

Co-Authored-By: Codex <noreply@openai.com>

Author: Pigbibi

docker-compose.yml

@@ -27,7 +27,11 @@ services:
       # e2-micro has less than 1 GiB RAM. The upstream image defaults to
       # -Xmx768m, which can starve sshd/Docker/guest-agent. Keep this
       # configurable, but use a safer default for the current VM.
-      - JAVA_HEAP_SIZE=${JAVA_HEAP_SIZE:-512}
+      # 384 MiB was stable in the recovery smoke check: it leaves
+      # room for the guest OS and prevents the Gateway UI from being killed
+      # before the login dialog can report a broker-side failure. Operators can
+      # still set JAVA_HEAP_SIZE explicitly for a larger VM.
+      - JAVA_HEAP_SIZE=${JAVA_HEAP_SIZE:-384}
       # The upstream vmoptions use 20 parallel GC threads, which is too
       # aggressive for the current 2 vCPU VM and can slow Gateway startup.
       - IB_GATEWAY_PARALLEL_GC_THREADS=${IB_GATEWAY_PARALLEL_GC_THREADS:-2}

tests/test_docker_compose_ports.sh

@@ -53,7 +53,7 @@ grep -Fq '      - IBC_SECOND_FACTOR_AUTHENTICATION_EXIT_INTERVAL=${IBC_SECOND_FA
 grep -Fq '      - EXISTING_SESSION_DETECTED_ACTION=${EXISTING_SESSION_DETECTED_ACTION:-primary}' "$compose_file"
 grep -Fq '      - IBKR_2FA_AUTOFILL=${IBKR_2FA_AUTOFILL:-yes}' "$compose_file"
 grep -Fq '      - IBKR_2FA_MAX_SUBMISSIONS=${IBKR_2FA_MAX_SUBMISSIONS:-1}' "$compose_file"
-grep -Fq '      - JAVA_HEAP_SIZE=${JAVA_HEAP_SIZE:-512}' "$compose_file"
+grep -Fq '      - JAVA_HEAP_SIZE=${JAVA_HEAP_SIZE:-384}' "$compose_file"
 grep -Fq '      - IB_GATEWAY_PARALLEL_GC_THREADS=${IB_GATEWAY_PARALLEL_GC_THREADS:-2}' "$compose_file"
 grep -Fq '      - IB_GATEWAY_CONC_GC_THREADS=${IB_GATEWAY_CONC_GC_THREADS:-1}' "$compose_file"
 grep -Fq '      - ACCEPT_API_FROM_IP=${ACCEPT_API_FROM_IP:?Set ACCEPT_API_FROM_IP to your Cloud Run egress subnet or connector CIDR}' "$compose_file"