Take two: Make local/docker implementation platform-aware

[bojidar-bg]

Second attempt at #302 after buildpacks/lifecycle#1605.

Poking around the failed to export: saving image: failed to fetch base layers: error, I discovered that:

1. The ID returned by docker image inspect --platform ... i useless for use with other commands. (See also c8d: unable to reference platform-specific images by ID moby/moby#49995) Hence, we run both a platform-specific inspect for the layer info and a platform-agnostic inspect for the image ID.
2. ImageHistory also has a --platform argument. Passing in the same platform as used for inspecting the image seems prudent.
3. ensureLayers calls ImageSave which also has a --platform argument. We need to pass that, as otherwise we will try to load layers for the wrong architecture.
4. ImageLoad and ImageRemove also have platform arguments. ImageLoad is going to autodetect the correct platform when we pass it with the tar archive; ImageRemove deleting the other platforms under the same tag is probably a good thing.

I tested locally with creating an linux/amd64 builder from a lifecycle which includes the new changes.

Exported image arch.	Old lifecycle	New lifecycle (with this PR)
Invoke amd64 builder with docker, amd64 host	linux/amd64	linux/amd64
Invoke amd64 builder with pack CLI, amd64 host	linux/amd64	linux/amd64
Invoke amd64 builder with docker, arm64 host	linux/arm64 - wrong	linux/amd64
Invoke amd64 builder with pack CLI, arm64 host	linux/arm64 - wrong	linux/amd64

[codecov]

Codecov Report

❌ Patch coverage is 68.36735% with 31 lines in your changes missing coverage. Please review.
✅ Project coverage is 34.66%. Comparing base (ee231a0) to head (c36b3eb).
⚠️ Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #305      +/-   ##
==========================================
+ Coverage   34.06%   34.66%   +0.61%     
==========================================
  Files          39       39              
  Lines        3301     3359      +58     
==========================================
+ Hits         1124     1164      +40     
- Misses       1982     2000      +18     
  Partials      195      195              

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[bojidar-bg]

Dropped the ball on this for a while, but finally got around to polishing it up. Tested with a lifecycle built with the PRed version of imgutils on a few different platforms, and it seemed to be working. 😃

(Unsure if the windows failure is related to my changes.)

[jabrown85]

this looks good - do you think we can get some tests with mocks? The new platform aware paths look right but tests mocking out the api version to confirm the called methods would make me feel a bit better.

[bojidar-bg]

I ended up adding a test job that uses containerd in the workflow, plus a test which only gets called in that job and should exercise the platform-aware code paths.

[jabrown85]

Thanks for this! I'll try and bump lifecycle to this commit and see how that lands.

[bojidar-bg]

Let's hope it has better luck than last time! 😅 😅