This allows more flexible control over the working directory. Values for workingDir must always start
with a / and will then be relative to the repo root.
The upside is that postgrest-with-postgresql-xxx postgrest-test-io works as expected
now. The downside is, that postgrest-with-postgresql-xxx psql now starts without
any schema. This now needs an explicit postgrest-with-postgresql-xxx -f path/to.sql
to do anything useful.
Resolves#2864
The recent nixpkgs update gave us a new version of vegeta. This version includes a new
DNS cache features - which unfortunately doesn't play well with unix sockets. Disabling
the DNS cache makes requests succeed again.
* Write vegeta output to file explicitly.
The previous version using `tee` captured the standard
output of the `withPgrst` helper, too, causing weird
errors when those had unexpected output.
* Log and fail the postgrest build explicitly.
In situations such as changing nix dependencies, the
`cabal build` run could fail, but this wasn't visible
in CI.
With these changes, the load test now fails with a nice
error message when the build fails.
