fix(discovery): BUILTIN_DISCOVERY_DISABLED can be specified even when PLATFORM is set (backport #1865)

[mergify]

This is an automatic backport of pull request #1865 done by Mergify.

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[andrewazores]

/build_test

[github-actions]

Workflow started at 2/6/2024, 12:21:46 PM. View Actions Run.

[github-actions]

ARCH	IMAGE
amd64	ghcr.io/cryostatio/cryostat:pr-1870-89909985ba9c53ec7edf1ae8a047e5ed3d3d08ef-linux-amd64
arm64	ghcr.io/cryostatio/cryostat:pr-1870-89909985ba9c53ec7edf1ae8a047e5ed3d3d08ef-linux-arm64

To run smoketest:

# amd64
CRYOSTAT_IMAGE=ghcr.io/cryostatio/cryostat:pr-1870-89909985ba9c53ec7edf1ae8a047e5ed3d3d08ef-linux-amd64 sh smoketest.sh

# or arm64
CRYOSTAT_IMAGE=ghcr.io/cryostatio/cryostat:pr-1870-89909985ba9c53ec7edf1ae8a047e5ed3d3d08ef-linux-arm64 sh smoketest.sh

[github-actions]

/build_test completed successfully ✅.
View Actions Run.