fix(ci): disable provenance on build-amd64 to keep pushes single-mani… #93

Job	Run time
lint-manifests	5s
build-amd64 (simple, Dockerfile_simple)	4m 38s
build-amd64 (full, Dockerfile)	3m 13s
build-arm64 (full, Dockerfile.arm)	9m 42s
build-arm64 (simple, Dockerfile_simple.arm)	5m 11s
test-apptainer	0s
publish-apptainer	0s
test-traefik	0s
create-manifest	-1s
test-nginx	-1s
	22m 47s

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