Also, promote defaults.run.shell from inside only the primary jobs to
the top level.
The src/ci/exec-with-shell.py wrapper script was formerly used to change
out the shell mid-job by intercepting a CI_OVERRIDE_SHELL environment
variable. Now, instead, we just set `bash` as the global default across
all jobs, and we also delete the exec-with-shell.py script.
Signed-off-by: Kristofer Rye <kristofer.rye@gmail.com>
A follow-up to #74406, this commit merely removes the `shell: bash`
lines where they are explicitly added in favor of setting defaults for
*all* "run" steps.
Signed-off-by: Kristofer Rye <kristofer.rye@gmail.com>
While for auto, try and PR builds we only want the latest commit to be
tested, that's not true for try builds: each commit pushed to the branch
is a different PR being tested, and we want multiple PRs to be tested in
parallel if there is enough demand.
Fixes#70569
