fix: show warning when config is invalid #2094

Job	Run time
Security Audits	21s
Lints	1m 2s
Tests	1m 50s
Shellcheck	7s
Test Release Process	5m 16s
image-provenance	-1s
goreleaser	-1s
verification-with-cosign	0s
binary-provenance	0s
verification-with-slsa-verifier	0s
	8m 34s

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