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Create your profile repository
Make a public repo named exactly like your GitHub username, with a README.md.
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Add the workflow
Create .github/workflows/contribution-animation.yml in that repo:
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Run it once
Open the repo's Actions tab, choose Contribution animation, press Run workflow. When it finishes, an output branch holds your SVG.
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Add it to your profile README
Used only to fill in the snippet. It never leaves your browser.
After the first run, the image updates by itself once a day.