tests: trim releases for upgrade testing — radicle-ci-broker

Signed-off-by: Lars Wirzenius liw@liw.fi

 given a directory reports
 when I touch file run-list.txt
 when I run ./env.sh bash -x verify-upgrade run-list.txt 869b451728d16719b560df142b2d901cbaf3764c
 when I run ./env.sh bash -x verify-upgrade run-list.txt 70f1ba7de5950c8e544fc35e49a7f1123c34d96f
 when I run ./env.sh bash -x verify-upgrade run-list.txt 6dc8f8e2024d450a7bb6ca5e13cfc31de49d5b6e
 when I run ./env.sh bash -x verify-upgrade run-list.txt 14d7b5322b87eac37af183c08437534bb20f19f5
 when I run ./env.sh bash -x verify-upgrade run-list.txt 64e76a97a817c87a72bb4cded661488c225410b7
 when I run ./env.sh bash -x verify-upgrade run-list.txt HEAD
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