In an attempt to: - make on-boarding a bit easier (`go test ./...` should now not need additional postgres setup) - get code coverage faster, not only scheduled at night - test the `create-account` binary
Needs https://github.com/matrix-org/sytest/pull/1308 to be actually useful. Not sure if we need to run Sytest in all combinations with enabled race detection. Closes https://github.com/matrix-org/dendrite/issues/491