wait for the workers become available again to continue the execution

[cpanato]

Summary

• wait for the workers become available again to continue the execution

if you run in the container we saw some run that the verification failed

$ docker run gcr.io/projectsigstore/cosign:v2.1.0 verify --certificate-oidc-issuer=https://accounts.google.com --certificate-identity=keyless@distroless.iam.gserviceaccount.com gcr.io/distroless/static-debian11                                                                                                                                                                                                                                                                                           WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested                                                                                                                                                                                                                                                                                                                                                   Error: no matching signatures: nil certificate provided
main.go:69: error during command execution: no matching signatures: nil certificate provided

and eventually, that works if you increase the workers to let's say 50 that worked. this is because we were aborting the full execution of the signatures if the request jobs were bigger than the workers, now we wait for the workers be available to continue the process.

[codecov]

Codecov Report

Merging #3084 (3da2c65) into main (412a096) will decrease coverage by 0.52%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #3084      +/-   ##
==========================================
- Coverage   30.63%   30.11%   -0.52%     
==========================================
  Files         155      155              
  Lines        9793     9791       -2     
==========================================
- Hits         3000     2949      -51     
- Misses       6343     6411      +68     
+ Partials      450      431      -19     

Impacted Files	Coverage Δ
pkg/cosign/verify.go	35.43% <0.00%> (+0.07%)	⬆️

... and 4 files with indirect coverage changes