Fix certificate validation errors during environment setup on CI
See, for example, https://app.circleci.com/pipelines/github/PrivateStorageio/ZKAPAuthorizer/890/workflows/8e3c1f4b-2c2c-446c-8a37-9e77c5cdd9f6/jobs/2408
cachix: ConnectionError (HttpExceptionRequest Request {
host = "cachix.org"
port = 443
secure = True
requestHeaders = [("Accept","application/json;charset=utf-8,application/json"),("Authorization","<REDACTED>"),("User-Agent","cachix 0.6.0")]
path = "/api/v1/cache/privatestorage-opensource"
queryString = ""
method = "GET"
proxy = Nothing
rawBody = False
redirectCount = 10
responseTimeout = ResponseTimeoutDefault
requestVersion = HTTP/1.1
}
(InternalException (HandshakeFailed (Error_Protocol ("certificate has unknown CA",True,UnknownCa)))))
Exited with code exit status 1
CircleCI received exit code 1