Release workflow doesn't run tests successfully but continues anyway

[tsibley]

The test step:

augur/.github/workflows/release.yaml

Line 28 in 227f526

- run: devel/test

doesn't error on test failures because devel/test masks the exit status:

augur/devel/test

Lines 28 to 30 in 227f526

	# Run unit and functional tests.
	echo Running tests
	./run_tests.sh || true

I noticed this with the 26.0.0 release just now, but it's been happening with past release workflow runs too.

While we can "fix" this by propagating the exit status in devel/test, I don't think devel/test is really appropriate for CI/CD, at least in its current developer-focused form. Our release process should ideally use a very similar test setup as CI does, or even be part of the CI/CD workflow.

[victorlin]

How about something like #1634?

[tsibley]

Left commentary there.