Add step to capture commits

[neil-ptr]

Related onflow/next-docs-v1#384

Description

Adds a step to capture commits to send to the refresh endpoint for the docsite

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For contributor use:

• [x] Targeted PR against master branch
• [x] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• [ ] Updated relevant documentation
• [x] Re-reviewed Files changed in the Github PR explorer
• [x] Added appropriate labels

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Name	Status	Preview	Updated
flow-docs	✅ Ready (Inspect)	Visit Preview	Jul 15, 2022 at 6:12PM (UTC)