revert convertion of default to string #865

Job	Run time
Validate access to mock-rock	3s
pytest	14s
bats	14s
build-rock / configure-build	15s
build-rock / lpci-build \| ${{ matrix.architecture }} ${{ (((inputs.build-id != '') && format('\| {0}', inputs.build-id)) \|\| ' ') }}	0s
build-rock / runner-build \| amd64	3m 31s
build-rock / assemble-rock	15s
test-rock / configure-tests \| mock-rock	18s
test-rock / test-black-box \| mock-rock	10s
test-rock / test-black-box \| mock-rock	9s
test-rock / test-efficiency ${{ (((inputs.oci-archive-name != '') && format('\| {0}', inputs.oci-archive-name)) \|\| ' ') }}	0s
test-rock / test-oci-compliance ${{ (((inputs.oci-archive-name != '') && format('\| {0}', inputs.oci-archive-name)) \|\| ' ') }}	0s
test-rock / test-malware ${{ (((inputs.oci-archive-name != '') && format('\| {0}', inputs.oci-archive-name)) \|\| ' ') }}	0s
test-rock / test-vulnerabilities ${{ (((inputs.oci-archive-name != '') && format('\| {0}', inputs.oci-archive-name)) \|\| ' ') }}	0s
	5m 9s

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