GitHub actions: externalize build matrix #773
Merged
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Description
This PR modifies the build workflow, to enable a more granular control on which containers are build depending on the triggering event. Specifically, the matrix definition is moved to an external json file, that is read and optionally filtered by a custom action during the pre-processing step. The current configuration ensures that all the core images are always built, while user environments are built only in case of stable releases and if the /deploy-staging command is triggered with an appropriate flag.
How Has This Been Tested?