lint-fmt failing with file permission error

[shonfeder]

Context

On https://ocaml.ci.dev/github/ocaml-multicore/picos/commit/9392f253fa5741352e552072335958d210334d0b/variant/%28lint-fmt%29

We are failing with

rm: cannot remove '/home/opam/.opam/4.08/.opam-switch/sources/astring.0.8.5/test/total.ml': Permission denied
rm: cannot remove '/home/opam/.opam/4.08/.opam-switch/sources/astring.0.8.5/test/testing.mli': Permission denied
rm: cannot remove '/home/opam/.opam/4.08/.opam-switch/sources/astring.0.8.5/test/testing.ml': Permission denied

Step(s) to reproduce

Reruning the job is reproducing

Technical details

I've run the steps on the base docker container, and it's working as expected. So it doesn't seem to be an issue with the base image.

[mtelvers]

I wonder if it is worker specific? I've moved the job to another worker. The queue is heavily backlogged so it'll be tomorrow before we see a result.

[shonfeder]

It is not worker specific. Happening now on x86-bm-c9.sw.ocaml.org :/ seems the file perms have been borked some how?

https://ocaml.ci.dev/github/ocurrent/ocaml-ci/commit/dd5494c1332e687b8ae0cf44e756ccaa26b87b47/variant/%28lint-fmt%29

[shonfeder]

This is fixed by 48ba2f5

The cause was an error I introduced in #937 by mixing up the order of the docker actions. Sorry for the trouble and noise there.