minor: Jenkins pipeline: timestamps, retries, volumes cleanup
minor: Jenkins pipeline: timestamps, retries, volumes cleanup

rnveach/checkstyle,checkstyle/checkstyle,romani/checkstyle,rnveach/checkstyle,romani/checkstyle,checkstyle/checkstyle,rnveach/checkstyle,rnveach/checkstyle,checkstyle/checkstyle,checkstyle/checkstyle,romani/checkstyle,romani/checkstyle,romani/checkstyle,checkstyle/checkstyle,rnveach/checkstyle,checkstyle/checkstyle,romani/checkstyle,rnveach/checkstyle