docker: add workflow to test image works

[abitrolly]

Add Docker image build and run to CI, because it is broken at the moment, and it is not clear since when.

root@04c0e0197e05:/workdir# snapcraft
/snap/bin/snapcraft: 3: exec: /snap/snapcraft/current/usr/bin/python3: not found

Seems like poured binaries are incompatible with system libs.

root@04c0e0197e05:/workdir# ldd snapcraft
ldd: ./snapcraft: No such file or directory
root@04c0e0197e05:/workdir# ldd `which snapcraft`
        not a dynamic executable
root@04c0e0197e05:/workdir# ldd /snap/snapcraft/current/usr/bin/python3
/snap/snapcraft/current/usr/bin/python3: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.35' not found (required by /snap/snapcraft/current/usr/bin/python3)
/snap/snapcraft/current/usr/bin/python3: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.29' not found (required by /snap/snapcraft/current/usr/bin/python3)
/snap/snapcraft/current/usr/bin/python3: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.28' not found (required by /snap/snapcraft/current/usr/bin/python3)
/snap/snapcraft/current/usr/bin/python3: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.25' not found (required by /snap/snapcraft/current/usr/bin/python3)
/snap/snapcraft/current/usr/bin/python3: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.26' not found (required by /snap/snapcraft/current/usr/bin/python3)
/snap/snapcraft/current/usr/bin/python3: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.27' not found (required by /snap/snapcraft/current/usr/bin/python3)
/snap/snapcraft/current/usr/bin/python3: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by /snap/snapcraft/current/usr/bin/python3)
/snap/snapcraft/current/usr/bin/python3: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by /snap/snapcraft/current/usr/bin/python3)
/snap/snapcraft/current/usr/bin/python3: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by /snap/snapcraft/current/usr/bin/python3)
        linux-vdso.so.1 =>  (0x00007f20bc07e000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f20bb400000)
        libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f20bb000000)
        libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f20bac00000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f20ba800000)
        /snap/core22/current/lib64/ld-linux-x86-64.so.2 => /lib64/ld-linux-x86-64.so.2 (0x00007f20bbe00000)

• Have you followed the guidelines for contributing?
• Have you signed the CLA?
• Have you successfully run tox run -m lint?
• Have you successfully run tox run -e test-py310? (supported versions: py39, py310, py311, py312)

---

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.63%. Comparing base (654871d) to head (3ff7b50).
Report is 573 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (654871d) and HEAD (3ff7b50). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (654871d)	HEAD (3ff7b50)
	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5057      +/-   ##
==========================================
- Coverage   94.88%   89.63%   -5.25%     
==========================================
  Files         658      338     -320     
  Lines       55189    22460   -32729     
==========================================
- Hits        52364    20133   -32231     
+ Misses       2825     2327     -498     

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[abitrolly]

No more actual, see #5063.