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Liam DeBeasi fd5a1ac708 chore(ci): account for new screenshots in error logging (#28166)
Issue number: N/A

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## What is the current behavior?
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We checked `git diff` to see if new screenshots were generated. If no
new screenshots were generated then we print a user-friendly message
informing the dev what happened. However, `git diff` does not account
for untracked changes (i.e. new screenshots).

As a result, this prevented new screenshots from being committed.

## What is the new behavior?
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this PR. -->

- To fix this we use the `-N` flag which is short for `--intent-to-add`.
This adds an entry with no content which causes the new screenshots to
show up when running `git diff`. We later add the contents of the image.

Example test run of this working:
https://github.com/ionic-team/ionic-framework/actions/runs/6174263712/job/16759260534

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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and migration path for existing applications below. -->


## Other information

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screenshots of how the component looks before and after the change. -->
2023-09-13 15:57:17 +00:00
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