docker: port is an integer #7202

Job	Run time
build	2m 7s
check_commits	6s
check_generated_railjson_sync	25s
check_infra_schema_sync	19s
check_integration_tests	1m 39s
check_osrd_schema	46s
check_railjson_generator	1m 43s
check_toml	9s
Check final newline	9s
check_front_rtk_sync	1m 27s
check_editoast_lints	5m 0s
check_editoast_openapi	1m 31s
check_core	4m 4s
check_editoast_tests	5m 54s
check_gateway	2m 8s
check_front	2m 29s
integration_tests	4m 46s
	34m 42s

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