fix: allow obtaining diff paths for root commit

[hiddeco]

The previous approach was inherited from when there was a need to be able to obtain the diff paths for a range of commits. With the refactoring in v0.7.0, however, this is no longer a requirement.

Because of this, we can switch to git show to obtain the diff paths for a specific commit. Using --name-only to print the paths, while further supplying --pretty="" to omit any other commit (message) data. Effectively yielding the same output as the previous command, except that it now also works for root commits.

Fixes: #2140

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[krancour]

time="2024-06-11T16:21:54Z" level=error msg="Reconciler error" Warehouse="{test demo}" controller=warehouse controllerGroup=kargo.akuity.io controllerKind=Warehouse error="error discovering artifacts: error discovering commits: error listing commits from git repo \"https://github.com/krancour/kargo-demo-gitops-2.git\": error getting diff paths for commit \"5e48a597589d86abb2e46db8753468209ef33528\" in git repo \"https://github.com/krancour/kargo-demo-gitops-2.git\": error getting diff paths for commit \"5e48a597589d86abb2e46db8753468209ef33528\": error executing cmd [/usr/bin/git show --pretty=\"\" --name-only 5e48a597589d86abb2e46db8753468209ef33528]: fatal: invalid --pretty format: \"\"\n" name=test namespace=demo reconcileID="\"5a57ce2e-cbbd-43fc-acab-721b858a0d46\""

[krancour]

The git binary on the image is too old. It doesn't have the --pretty option on git show

[krancour]

https://github.com/akuity/kargo-render/pull/289

[hiddeco]

Think the error is not related to this, but to a newline which somehow gets injected into the empty format string. (Updating Alpine is nonetheless a great idea.)

Give me a bit to figure out what the culprit is.

[krancour]

The git binary on the image is too old. It doesn't have the --pretty option on git show

I stand corrected on this matter. I tried it again and it's fine. idk what I was looking at before. 🤷‍♂️

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 45.93%. Comparing base (e2a8e5f) to head (ea3a8f8).

Files	Patch %	Lines
internal/controller/git/git.go	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2141 +/- ## ======================================= Coverage 45.93% 45.93% ======================================= Files 238 238 Lines 16542 16542 ======================================= Hits 7599 7599 Misses 8571 8571 Partials 372 372 ```

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[krancour]

Can confirm https://github.com/akuity/kargo/pull/2141/commits/ea3a8f8709f476c5c3162e00f6aeb07a2a7bac79 does the trick.

[akuitybot]

Successfully created backport PR for release-0.7:

• 2143