.gitlab-ci.d: Make separate collapsible log sections for build and test

.gitlab-ci.d: Make separate collapsible log sections for build and test

GitLab lets a CI job create its own collapsible log sections by
emitting special escape codes, as documented here:

https://docs.gitlab.com/ee/ci/yaml/script.html#expand-and-collapse-job-log-sections

Use these to make "configure", "build" and "test" separate
collapsible stages.

As recommended by the GitLab docs, we use some shell which is
sourced in the CI job to define functions to emit the magic
lines that start and end sections, to hide the ugliness of
the printf lines from the log.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20240918125449.3125571-3-peter.maydell@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>