bk: support packaging for PRs too #22255

Job	Run time
test (macos-latest)	4m 30s
test (ubuntu-latest)	4m 4s
test (windows-2025)	8m 10s
system-test-fips	9m 15s
lint	2m 24s
test-package	5m 24s
system-test	8m 47s
test-package-and-push	6m 13s
test-fips	4m 9s
test-integration-server-internal	1m 53s
validate-wolfi-docker-image	0s
	54m 49s

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