Debug build should be part of PR test suite

[tuminoid]

It would be nice to have the debug build as part of PR tests to avoid breaking debug builds when changing CMake files. A breakage was fixed in #2805 after protobuf build was changed in #2792 and it was not detected by PR author, reviewers nor PR tests in CI automation.

Originally posted by @tuminoid in #2805 (review)

[poiana]

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[tuminoid]

/kind ci

[poiana]

@tuminoid: The label(s) kind/ci cannot be applied, because the repository doesn't have them.

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/kind ci

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