Use explicit Docker subnets in API CI

.github/docker-compose.ci.yml

@@ -82,3 +82,9 @@ services:
 
 volumes:
   ci_php_app:
+
+networks:
+  default:
+    ipam:
+      config:
+        - subnet: "${CI_DOCKER_SUBNET:-10.240.0.0/24}"

.github/workflows/tests.yml

@@ -207,6 +207,10 @@ jobs:
           staging_port="$(find_free_port "$((websecure_port + 1))" "$((websecure_port + 2000))")"
           metrics_port="$(find_free_port "$((staging_port + 1))" "$((staging_port + 2000))")"
           broker_port="$(find_free_port "$((metrics_port + 1))" "$((metrics_port + 2000))")"
+          checksum="$(printf '%s' "$COMPOSE_PROJECT_NAME" | cksum | awk '{print $1}')"
+          subnet_second=$((64 + ((checksum / 256) % 64)))
+          subnet_third=$((checksum % 256))
+          ci_docker_subnet="10.${subnet_second}.${subnet_third}.0/24"
 
           {
             echo "TRAEFIK_WEB_PORT=${web_port}"
@@ -214,6 +218,7 @@ jobs:
             echo "TRAEFIK_WEBSECURE_STAGING_PORT=${staging_port}"
             echo "TRAEFIK_METRICS_PORT=${metrics_port}"
             echo "EDGE_BROKER_CI_PORT=${broker_port}"
+            echo "CI_DOCKER_SUBNET=${ci_docker_subnet}"
             echo "EDGE_GATEWAY_E2E_BASE_URL=http://localhost:${web_port}/api"
             echo "EDGE_GATEWAY_E2E_COMPOSE_PROJECT=${COMPOSE_PROJECT_NAME}"
           } >> "$GITHUB_ENV"

scripts/php-ci-test.sh

@@ -88,6 +88,17 @@ prune_unused_docker_networks() {
   docker network prune -f >/dev/null 2>&1 || true
 }
 
+configure_ci_docker_subnet() {
+  if [ -n "${CI_DOCKER_SUBNET:-}" ]; then
+    return
+  fi
+
+  checksum="$(printf '%s' "$COMPOSE_PROJECT_NAME" | cksum | awk '{print $1}')"
+  subnet_second=$((64 + ((checksum / 256) % 64)))
+  subnet_third=$((checksum % 256))
+  export CI_DOCKER_SUBNET="10.${subnet_second}.${subnet_third}.0/24"
+}
+
 cleanup() {
   status="$?"
   collect_logs "$status"
@@ -107,6 +118,7 @@ cleanup() {
 }
 trap cleanup EXIT INT TERM
 
+configure_ci_docker_subnet
 prune_unused_docker_networks
 retry_command "${PHP_CI_DOCKER_RETRIES:-3}" docker compose $compose_files up -d redis mysql-debug php1