ci: switch to custom docker images

[Borda]

What does this PR do?

debugging:

++ head -1 /proc/self/cgroup
++ cut -d/ -f3
+ container_id=
+ echo 'debconf debconf/frontend select Noninteractive'
+ debconf-set-selections
+ /tmp/docker exec -t -u 0 sh -c 'apt-get update && DEBIAN_FRONTEND=noninteractive apt-get -o Dpkg::Options::=--force-confold -y install sudo'
Error response from daemon: No such container: sh

Let's rather start to build own dockers which would have a few side adventures:

• cleaner workflow
• slightly faster runs
• better control over emv

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

Did you have fun?

Make sure you had fun coding 🙃

---

📚 Documentation preview 📚: https://torchmetrics--2123.org.readthedocs.build/en/2123/

[codecov]

Codecov Report

Merging #2123 (0a8d1f6) into master (39ba91a) will increase coverage by 2%.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #2123    +/-   ##
=======================================
+ Coverage      85%     87%    +2%     
=======================================
  Files         293     293            
  Lines       16324   16327     +3     
=======================================
+ Hits        13818   14187   +369     
+ Misses       2506    2140   -366     

[Borda]

Let's rather start to build own dockers which would have a few side adventures:

• cleaner workflow
• slightly faster runs
• better control over emv

[Borda]

took an advantage and renamed requirements' files meant purely for development (tests, docs, integrate) to separate that they are not meant clearly to be extras