Github Actions not letting me commit index.hbs to site

Weird one.

Run TryGhost/action-deploy-theme@v1.4.0
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/usr/bin/zip -r Caffeine.zip . -x *.git* *.zip yarn* npm* node_modules* *routes.yaml *redirects.yaml *redirects.json
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  adding: LICENSE (deflated 41%)
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  adding: assets/ (stored 0%)
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  adding: assets/built/ (stored 0%)
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  adding: assets/built/main.min.js.map (deflated 67%)
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  adding: assets/built/screen.css (deflated 78%)
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  adding: assets/built/screen.css.map (deflated 80%)
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  adding: assets/built/main.min.js (deflated 64%)
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  adding: assets/css/ (stored 0%)
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  adding: assets/css/screen.css (deflated 78%)
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  adding: assets/js/ (stored 0%)
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  adding: assets/js/main.js (deflated 7%)
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  adding: assets/images/ (stored 0%)
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  adding: assets/images/preloader.gif (deflated 44%)
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  adding: assets/images/default-skin.png (deflated 1%)
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  adding: assets/images/default-skin.svg (deflated 61%)
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  adding: author.hbs (deflated 72%)
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  adding: index.hbs (deflated 78%)
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  adding: tag.hbs (deflated 62%)
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  adding: partials/ (stored 0%)
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  adding: partials/loop.hbs (deflated 59%)
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  adding: partials/icons/ (stored 0%)
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  adding: partials/icons/avatar.hbs (deflated 30%)
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  adding: partials/icons/arrow-left.hbs (deflated 36%)
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  adding: partials/icons/star.hbs (deflated 24%)
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  adding: partials/icons/facebook.hbs (deflated 43%)
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  adding: partials/icons/arrow-right.hbs (deflated 36%)
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  adding: partials/icons/twitter.hbs (deflated 47%)
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  adding: partials/icons/email.hbs (deflated 54%)
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  adding: partials/content-cta.hbs (deflated 59%)
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  adding: partials/pswp.hbs (deflated 77%)
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  adding: post.hbs (deflated 76%)
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  adding: package.json (deflated 65%)
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  adding: default.hbs (deflated 71%)
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  adding: fonts/ (stored 0%)
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  adding: fonts/inter-var-latin.woff2 (deflated 0%)
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  adding: .DS_Store (deflated 93%)
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  adding: README.md (deflated 46%)
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Error: Request failed with status code 500
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    at createError (/home/runner/work/_actions/TryGhost/action-deploy-theme/v1.4.0/dist/index.js:975:15)
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    at settle (/home/runner/work/_actions/TryGhost/action-deploy-theme/v1.4.0/dist/index.js:8530:12)
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    at IncomingMessage.handleStreamEnd (/home/runner/work/_actions/TryGhost/action-deploy-theme/v1.4.0/dist/index.js:9559:11)
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    at IncomingMessage.emit (events.js:215:7)
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    at endReadableNT (_stream_readable.js:1184:12)
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    at processTicksAndRejections (internal/process/task_queues.js:80:21) {
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  isAxiosError: true,
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  toJSON: [Function]
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}