enh(ci): skip workflow when no change on PR #550

Job	Run time
get-environment / get-environment	11s
package el8	20s
unit-test-perl (unit-tests-alma8)	25s
package el9	20s
unit-test-perl (unit-tests-alma9)	24s
package bookworm	15s
unit-test-perl (unit-tests-bullseye-arm64)	29s
unit-test-perl (unit-tests-bookworm)	20s
veracode-analysis / Check before analysis	1s
veracode-analysis / Binary preparation	1m 0s
robot-test-gorgone (el8)	33m 42s
robot-test-gorgone (el9)	32m 17s
robot-test-gorgone (bookworm)	28m 56s
deliver-rpm	0s
deliver-sources	0s
deliver-deb	0s
promote	0s
set-skip-label / set-pull-request-skip-label	2s
veracode-analysis / Sandbox scan	0s
	1h 38m 42s

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