tests(ci-broker.md): add upgrade testing of current source dir HEAD — radicle-ci-broker

This doesn’t test the uncommitted changes in the source tree, but it’s good enough for now.

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

 when I touch file run-list.txt
 when I run bash radenv.sh bash -x verify-upgrade run-list.txt 04ac3852a52a0256a126252b2c46dea225189441
 when I run bash radenv.sh bash -x verify-upgrade run-list.txt 5ae4d012f2b2f3df6fbbfce9b7d739f13363d0ec
 when I run bash radenv.sh bash -x verify-upgrade run-list.txt HEAD
 ~~~
 ~~~{#verify-upgrade .file .sh}