dockerfiles/dut: fix --chown option

[Bastian-Krause]

Description
The docker docs contain [1] these COPY forms:

COPY [--chown=<user>:<group>] [--chmod=<perms>] <src>... <dest>
COPY [--chown=<user>:<group>] [--chmod=<perms>] ["<src>",... "<dest>"]

Arguments within [ ] are optional. The square brackets are not meant to be part of the actual instruction.

The docker docs [1] mention that "[e]ach may contain wildcards and matching will be done using Go’s filepath.Match rules". Go’s filepath.Match [2] interprets terms in square brackets as a character class. [--chown=root:root] must have been interpreted as a valid character class until recently. A couple of days ago, building the "dut" service started failing:

  Building dut
  #0 building with "default" instance using docker driver

  #1 [internal] load build definition from Dockerfile
  #1 transferring dockerfile: 924B done
  #1 DONE 0.0s

  #2 [internal] load .dockerignore
  #2 transferring context: 2B done
  #2 DONE 0.0s

  #3 [internal] load metadata for docker.io/library/debian:bookworm-slim
  #3 DONE 0.1s

  #4 [1/4] FROM docker.io/library/debian:bookworm-slim@sha256:89468107e4c2b9fdea2f15fc582bf92c25aa4296a661ca0202f7ea2f4fc3f48c
  #4 CACHED

  #5 [internal] load build context
  #5 transferring context: 56B done
  #5 ERROR: error from sender: invalid includepatterns: []: syntax error in pattern

Fix this by dropping the accidental square brackets around the --chown option.

[1] https://docs.docker.com/engine/reference/builder/#copy
[2] https://pkg.go.dev/path/filepath#Match

Checklist

• PR has been tested

Fixes #540

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (b0fe8dc) 62.9% compared to head (0523400) 62.9%.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1256   +/-   ##
======================================
  Coverage    62.9%   62.9%           
======================================
  Files         161     161           
  Lines       11861   11861           
======================================
  Hits         7469    7469           
  Misses       4392    4392           

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