Uses defer and listens for SIGTERM
As well as doing some other nice cleanup.

This will also no longer leave backup files in the
mw directory which is nice :)

Bug: T291529

Covers T282360

For now we don't need this, and we can always add
it back later

Had an extra $ that was missed and not needed

Addshore authored Sep 16, 2021 and Addshore committed Sep 16, 2021

This was prep work for maybe taking a look at T284227

Bug: T282337

Bug: T282337

Bug: T282337

Bug: T282352 (#282352)

Addshore authored Sep 10, 2021 and Addshore committed Sep 10, 2021

Bug: T288441 (#288441)

This is now fully handeled by the docker daemon
on the gitlab runner instead...