layer caching in CI

[chayim]

adding deps caching to descend for the docker images as well

[codecov]

Codecov Report

Merging #844 (c40178d) into master (de0f302) will increase coverage by 1.27%.
The diff coverage is 91.45%.

@@            Coverage Diff             @@
##           master     #844      +/-   ##
==========================================
+ Coverage   79.97%   81.25%   +1.27%     
==========================================
  Files          53       55       +2     
  Lines        8009     8145     +136     
==========================================
+ Hits         6405     6618     +213     
+ Misses       1604     1527      -77     

Impacted Files	Coverage Δ
src/serialization/AOF/rai_aof_rewrite.c	0.00% <0.00%> (ø)
.../serialization/RDB/decoder/previous/v2/decode_v2.c	46.56% <0.00%> (+9.81%)	⬆️
src/execution/parsing/deprecated.c	81.18% <66.66%> (+1.48%)	⬆️
...c/serialization/RDB/decoder/current/v4/decode_v4.c	71.42% <71.42%> (ø)
.../serialization/RDB/decoder/previous/v0/decode_v0.c	63.33% <72.72%> (+1.69%)	⬆️
tests/module/LLAPI.c	75.91% <79.06%> (+1.44%)	⬆️
src/serialization/RDB/encoder/v4/encode_v4.c	85.96% <81.81%> (ø)
src/backends/tensorflow.c	72.16% <91.00%> (+3.12%)	⬆️
src/backends/onnxruntime.c	78.80% <91.86%> (+1.42%)	⬆️
src/redis_ai_objects/tensor.c	91.93% <94.71%> (+5.24%)	⬆️
... and 17 more

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