Use explicit Docker subnets in API CI

.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"