[Enhancement] Skip CI when some specific files were changed

[gaotongxiao]

Related PR: open-mmlab/mmcv#1533

[codecov]

Codecov Report

Merging #642 (c941b98) into main (e203d54) will increase coverage by 0.30%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #642      +/-   ##
==========================================
+ Coverage   84.92%   85.22%   +0.30%     
==========================================
  Files         143      145       +2     
  Lines        9809     9856      +47     
  Branches     1469     1482      +13     
==========================================
+ Hits         8330     8400      +70     
+ Misses       1150     1128      -22     
+ Partials      329      328       -1     

Flag	Coverage Δ
unittests	85.22% <ø> (+0.30%)	⬆️

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Impacted Files	Coverage Δ
mmocr/utils/ocr.py	75.34% <0.00%> (-0.36%)	⬇️
mmocr/models/textrecog/encoders/satrn_encoder.py	100.00% <0.00%> (ø)
mmocr/models/textrecog/layers/transformer_layer.py
...r/models/textrecog/encoders/transformer_encoder.py
...r/models/textrecog/decoders/transformer_decoder.py
mmocr/models/textrecog/encoders/nrtr_encoder.py	100.00% <0.00%> (ø)
mmocr/models/textrecog/decoders/nrtr_decoder.py	97.18% <0.00%> (ø)
mmocr/models/textrecog/layers/satrn_layers.py	100.00% <0.00%> (ø)
mmocr/models/common/layers/transformer_layers.py	96.87% <0.00%> (ø)
mmocr/models/common/modules/transformer_module.py	98.68% <0.00%> (ø)
... and 5 more

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