Would like to achieve queue step in build stage now through CI pipelines

Example:

pipelineA:

execution 1====>running-----stepA passed

execution 2====>running-----stepA not hit yet

execution 3====>running-----stepA running

execution 4====>running up to stepA, then wait until all 3 running execution (1-3) completed step A, then I can start stepA

As per ENG: we can have a step which always executes that does the cleanup or have a ttl associated with the key.