ci: ignore proto files

[3Hren]

No description provided.

[codecov-io]

Codecov Report

Merging #422 into master will increase coverage by 5.35%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #422      +/-   ##
==========================================
+ Coverage   18.93%   24.29%   +5.35%     
==========================================
  Files          96       84      -12     
  Lines        9761     7167    -2594     
==========================================
- Hits         1848     1741     -107     
+ Misses       7722     5235    -2487     
  Partials      191      191

Impacted Files	Coverage Δ
proto/bid.pb.go
proto/hub.pb.go
proto/deal.pb.go
proto/insonmnia.pb.go
proto/node.pb.go
proto/timestamp.pb.go
proto/miner.pb.go
proto/bigint.pb.go
proto/marketplace.pb.go
proto/capabilities.pb.go
... and 2 more

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