ci: Use a docker image for builds and tests
Avoid repeating the machine updates and deps installation at every stage, just reuse the docker image
Registered images are at: https://gitlab.freedesktop.org/libfprint/libfprint/container_registry
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Avoid repeating the machine updates and deps installation at every stage, just reuse the docker image
Registered images are at: https://gitlab.freedesktop.org/libfprint/libfprint/container_registry