Fix startup of supervisord #283

Job	Run time
build_bases (latest)	1m 34s
build_bases (stable)	1m 37s
build_bases (legacy)	1m 20s
build_variants (latest, allinone)	2m 1s
build_variants (latest, nginx)	1m 23s
build_variants (latest, phponly)	1m 46s
build_variants (stable, allinone)	1m 44s
build_variants (stable, nginx)	1m 19s
build_variants (stable, phponly)	1m 45s
build_variants (legacy, allinone)	1m 38s
build_variants (legacy, nginx)	1m 20s
build_variants (legacy, phponly)	1m 52s
test_aio (latest)	1m 33s
test_prod (latest)	1m 53s
test_aio (stable)	1m 34s
test_aio (legacy)	1m 39s
test_prod (stable)	1m 54s
test_prod (legacy)	1m 52s
push_ghcr	0s
	29m 44s

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