Skip vaapi test on CI

[at-wat]

DRI device appears on GitHub Actions runner but unusable. (vainfo errors as well)
Skip pkg/codec/vaapi on CI.

[codecov]

Codecov Report

Base: 47.81% // Head: 58.15% // Increases project coverage by +10.34% 🎉

Coverage data is based on head (da98384) compared to base (7335797).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #447       +/-   ##
===========================================
+ Coverage   47.81%   58.15%   +10.34%     
===========================================
  Files          67       62        -5     
  Lines        4476     3680      -796     
===========================================
  Hits         2140     2140               
+ Misses       2209     1413      -796     
  Partials      127      127               

Impacted Files	Coverage Δ
pkg/codec/vaapi/framerate.go
pkg/codec/vaapi/params.go
pkg/codec/vaapi/vp9.go
pkg/codec/vaapi/vaapi.go
pkg/codec/vaapi/vp8.go

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