Add Goal icons

[gavinmn]

Closes https://github.com/github/primer/issues/1445

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🦋 Changeset detected

Latest commit: 84ce5fc

The changes in this PR will be included in the next version bump.

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@primer/octicons	Minor

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[colebemis]

Love it! 😍

Have you tried using a 0.25px corner radius on the end of the arrow for consistency with other icons?

Here's the section about that in the design guidelines: https://primer.style/octicons/guidelines/design#corners

[gavinmn]

@colebemis that's a great call! I had originally tried this but got a result that was much too round so I went with a 0 px radius. I just realized tho that it was because I was applying the rounding to the icon before flattening it. I just commited some new icons that should fix this inconsistency.

[gavinmn]

@colebemis is this good to go?

[colebemis]

Ship it 🎯