Trigger CI workflows based on assigned label. #4348
Merged
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This PR does two things.
First, it adds a mechanism to optionally trigger certain CI runs (sanitizers, ubuntu18, validation) by adding the corresponding label to the PR.
Second, it makes the installation of Python packages for Protobuf subject to the Python version. This way we can install the correct version of a Python package depending on the version being used. This fixes the Ubuntu 18 build issues.