Work around issue with brew and opam (#1989) #765

Job	Run time
docker-master	1h 30m 25s
publish-standalone-dry-run	18s
test-standalone (master, dev, default)	1m 28s
validate-docker-master	23m 12s
build-wasm-of-ocaml (master, 4.14.1)	17m 19s
build-js-of-ocaml (master, 4.11.1)	12m 15s
generated-files (master)	57s
standalone-haskell (master)	45m 33s
test-amd64	2h 16m 30s
deploy-js-wasm-of-ocaml	32s
docker-check-all	7s
	5h 28m 36s

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