Please describe your feature

Let's have an option in buildtest build to exclude by tags. We can already search by tags buildtest bd -t tag1,tag2 which will discover buildspecs. We also have option to filter by tags buildtest bd --filter tags=tag1 but there is no way to exclude tags.

For instance if one wants to build all tests in a directory and exclude all test by given tag name this is not possible at the moment.

Suggest potential solution

Introduce a new option buildtest bd -xt with long option --exclude-tags that work similar to -t so you can exclude tags

Here are two ways this can be used. We can do comma separated list and also append this multiple times

# comma separated
buildtest  bd -b /path/to/dir -xt cuda,mpi

buildtest bd -b example.yml -xt cuda -xt mpi

The exclusion will exclude any test that are found in list of tags if tags is empty or there is no match then test will be processed.

Additional Information

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Is there an existing issue

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