This:
- drops the previous version of the tooling
- installs the new tooling:
- use set -e in the main script (soso command failures are immediately detectinged by icinga)
- the newscript triggered by the timer/service scripts updates all instances at once (in working order, first opam root
working order, first opam root with the default opam instance, then the other secondary repositories).
- The overall script triggered by the timer/service isecondary repositories). Implementation wise, it's looping othver all instances to init
init or update them all (in the proper order).
Related to T3826