Update ggcr and use the new tarball.WithCompressCaching

[mattmoor]

This simplifies the logic for creating layers and relies on the new option instead of pre-gzipping (and gunzip being faster). The net effect of this should be the elimination of an extra gunzip, but it should not materially impact the memory pressure because we were ALREADY caching the gzipped layers in-memory, we were just doing it on the caller side, which provided less benefit!

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[mattmoor]

CLA bot, you have the highest ratio of annoying to useful of anything in my life. 🤬

[codecov-io]

Codecov Report

Merging #263 (c6b2a04) into master (06ebf03) will decrease coverage by 0.17%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #263      +/-   ##
==========================================
- Coverage   37.06%   36.89%   -0.18%     
==========================================
  Files          33       33              
  Lines        1465     1461       -4     
==========================================
- Hits          543      539       -4     
  Misses        833      833              
  Partials       89       89              

Impacted Files	Coverage Δ
pkg/build/gobuild.go	57.66% <100.00%> (-0.56%)	⬇️

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[mattmoor]

@googlebot I signed it!

[mattmoor]

@googlebot rescan

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[google-cla]

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[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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What to do if you already signed the CLA

Individual signers

• It's possible we don't have your GitHub username or you're using a different email address on your commit. Check your existing CLA data and verify that your email is set on your git commits.

Corporate signers

• Your company has a Point of Contact who decides which employees are authorized to participate. Ask your POC to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the Google project maintainer to go/cla#troubleshoot (Public version).
• The email used to register you as an authorized contributor must be the email used for the Git commit. Check your existing CLA data and verify that your email is set on your git commits.
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[mattmoor]

@googlebot rescan

[google-cla]

CLAs look good, thanks!

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