Avoid rate limit for protoc github action install #147

Job	Run time
build	1m 49s
clippy	1m 44s
fmt	6s
tests (coverage-point-calculator)	1m 27s
tests (file-store)	1m 24s
tests (coverage-map)	1m 10s
tests (ingest)	1m 36s
tests (mobile-packet-verifier)	2m 10s
tests (reward-scheduler)	44s
tests (task-manager)	45s
tests-postgres (boost-manager)	2m 25s
tests-postgres (iot-config)	2m 17s
tests-postgres (iot-packet-verifier)	3m 30s
tests-postgres (iot-verifier)	2m 25s
tests-postgres (mobile-config)	2m 11s
tests-postgres (mobile-verifier)	2m 40s
build-release	0s
	28m 23s

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