Custom Docker images to speed up CI

[andrey-utkin]

This changeset introduces the first custom Docker container intended for RNP's CI. This Fedora 35 CI config intends to replace the existing config fedora35-ossl.yml (which is currently broken due to riboseinc repo signature issue). There seems to be no way to trigger GHA to run this CI configuration before it is merged to master. There is also a script ci/docker/fedora35.test-locally which shows how to use this container for local testing.

[codecov[bot]]

Codecov Report

Merging #1884 (a91ee25) into master (712ac3d) will increase coverage by 81.54%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1884       +/-   ##
===========================================
+ Coverage        0   81.54%   +81.54%     
===========================================
  Files           0      138      +138     
  Lines           0    28917    +28917     
===========================================
+ Hits            0    23580    +23580     
- Misses          0     5337     +5337     

Impacted Files	Coverage Δ
src/tests/ffi-key-prop.cpp	91.42% <0.00%> (ø)
src/examples/verify.c	65.33% <0.00%> (ø)
src/librepgp/stream-armor.h	90.90% <0.00%> (ø)
src/fuzzing/sigimport.c	100.00% <0.00%> (ø)
src/examples/dump.c	63.63% <0.00%> (ø)
src/tests/fuzz_verify_detached.cpp	100.00% <0.00%> (ø)
src/tests/rnp_tests.cpp	91.66% <0.00%> (ø)
src/lib/crypto/mem.h	100.00% <0.00%> (ø)
src/lib/crypto/ecdsa.cpp	71.94% <0.00%> (ø)
src/tests/rng-randomness.cpp	100.00% <0.00%> (ø)
... and 128 more

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[andrey-utkin]

Dear reviewers, could you please merge this? Current CI status is irrelevant - neither the product codebase nor the actual CI configuration was changed here. What matters is that after this is merged, the fedora35-lean GHA workflow will start working, and we want to see how it will work in practice.

[ronaldtse]

Since this is a CI change, one positive review is sufficient for merging. Merging now. Thank you @andrey-utkin !