ci: enable unionvisor-tests (#16)

* ci: enable unionvisor-tests

* test: trace_test cli tests

* test: ignore unionvisor::test_init

* test: remove unionvisor::test_call

test_call was a pretty irrelevant test, as we call
the binary in almost every single test.

* test(unionvisor): add dbg! for test_early_exit

* feat(unionvisor): allow setting the binary name

* test: add more debugging

* test: more debug info

* test: more, more debug info

* feat(unionvisor): add logging when detecting upgrade signals

* feat(unionvisor): log errors on try_wait

* test(unionvisor): switch to cargoTest

* test: more

* ci(unionvisor): add bash to the buildInputs

* ci(unionvisor): patch shebangs

* test: set shebang to /usr/bin/sh

* test: remove shebang

* test: try patchSehbangs for test_early_exit

* test: play around with patchShebangs

* test: switch back to nextest

* test(unionvisor): move patchShebangs to the configurePhase

* test(unionvisor): override installPhase

* test(unionvisor): we did it boys

* feat(unionvisor): cleanup processes when dropping supervisors