make conda installs in CI stricter (part 2)

[jameslamb]

Description

Follow-up to #1696

Changes relative to that PR:

• switches to pinning CI conda installs to the output of rapids-version ({major}.{minor}.{patch}) instead of rapids-version-major-minor ({major}.{minor}), to get a bit more protection in the presence of hotfix releases
• restores some exporting of variables needed for docs builds

In #1696, I'd missed that this project's Doxygen setup is expecting to find RAPIDS_VERSION_MAJOR_MINOR defined in the environment.

rmm/ci/build_docs.sh

Line 36 in 90a5631

doxygen Doxyfile

rmm/doxygen/Doxyfile

Line 41 in 90a5631

PROJECT_NUMBER = $(RAPIDS_VERSION_MAJOR_MINOR)

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[jakirkham]

Thanks James! 🙏

Is anything else still needed here?

[jameslamb]

Is anything else still needed here?

Probably not. Was just leaving it in draft to avoid bothering people with a review request until I was sure CI was passing.

[jameslamb]

/merge