fix: procmount should allow empty values #2055

Job	Run time
Require a suite.yaml file alongside every template.yaml	10s
Require a sync.yaml file and metadata.gatekeeper.sh/requires-sync-data annotation for every templ...	1m 26s
Verify assertions in suite.yaml files for cel policies	19s
generate	1m 51s
Verify assertions in suite.yaml files for cel policies	19s
Test scripts	1m 32s
Verify assertions in suite.yaml files for rego policies	19s
Verify assertions in suite.yaml files for rego policies	18s
Unit test on ubuntu-latest opa v0.44.0	11s
Unit test on ubuntu-latest opa v0.57.1	10s
Integration test on Gatekeeper 3.17.1 for cel policies	7m 15s
Unit test on macos-latest opa v0.44.0	20s
Integration test on Gatekeeper 3.17.1 for rego policies	7m 32s
Unit test on macos-latest opa v0.57.1	22s
Integration test on Gatekeeper 3.18.1 for cel policies	7m 4s
Integration test on Gatekeeper 3.18.1 for rego policies	7m 11s
	36m 19s

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