Fix bug with creating public rooms on workers #1177

Job	Run time
changes	3s
lint-newsfile	33s
check-lockfile	9s
lint-crlf	4s
check-schema-delta	40s
Typechecking	1m 26s
lint	55s
check-sampleconfig	45s
lint-clippy-nightly	0s
lint-pydantic	46s
lint-clippy	0s
lint-rustfmt	0s
linting-done	1s
calculate-test-jobs	6s
trial-olddeps	6m 58s
portdb (3.8, 11)	2m 50s
complement (monolith, SQLite)	13m 0s
portdb (3.11, 15)	2m 58s
complement (monolith, Postgres)	13m 25s
complement (workers, Postgres)	20m 40s
cargo-bench	0s
cargo-test	0s
trial-pypy	0s
trial (3.8, sqlite, all)	4m 15s
sytest (focal)	8m 43s
sytest (focal, postgres)	10m 5s
trial (3.8, postgres, 11, all)	9m 57s
trial (3.8, sqlite)	4m 0s
sytest (focal, multi-postgres, workers)	13m 32s
sytest (focal, multi-postgres, workers, asyncio)	19m 29s
export-data	2m 23s
tests-done	4s
	2h 17m 47s

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