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RVM installation added in PR #503 requires PGP keys used by RVM to be available. We pull those from a public key server pool. However, using just "pool.sks-keyservers.net" as recommended by RVM documentation seems to be too unreliable for CI setup. It works fine for singular installations, but when deployed to CircleCI pool-selected servers are often unavailable, time out, and break our builds. Instead of using a single server try multiple ones for each key that we wish to request.