Add flock test #3120

Job	Run time
lint-receptor	51s
lint-receptor	51s
container	2m 40s
container	2m 40s
receptor (Go 1.20)	3m 45s
receptor (Go 1.20)	3m 45s
receptor (Go 1.21)	6m 24s
receptor (Go 1.21)	6m 32s
Lint receptorctl / Run `receptorctl` check_format session	16s
Lint receptorctl / Run `receptorctl` check_format session	16s
Lint receptorctl / Run `receptorctl` check_style session	14s
Lint receptorctl / Run `receptorctl` check_style session	14s
Run receptorctl tests${{ '' }}	0s
Receptorctl test coverage	0s
Receptorctl test coverage (coverage)	1m 16s
Run receptorctl tests / Run `receptorctl` tests-3.10 session	1m 14s
Run receptorctl tests / Run `receptorctl` tests-3.11 session	1m 11s
Run receptorctl tests / Run `receptorctl` tests-3.12 session	1m 12s
Run receptorctl tests / Run `receptorctl` tests-3.8 session	1m 10s
Run receptorctl tests / Run `receptorctl` tests-3.9 session	1m 26s
	35m 57s

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