fix: Github CI example fails with single quote

[McPatate]

Description:

I am proposing a fix for the CI example in the README.

When someone commits a message containing a ', the CI will error given the raw JSON is simply enclosed with single quotes:

jq length <<< '${{ toJson(github.event.commits) }}'

cf https://github.com/huggingface/huggingface.js/pull/754 for more context

Checklist:

• ~[ ] Tests passing (make test-community)?~
• ~[ ] Lint passing (make lint this requires golangci-lint)?~

[CLAassistant]

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[dustin-decker]

What about this? Seems cleaner to not have a temp file or the Env: part of the config:

depth=$(($(jq length <<< "${{ toJson(github.event.commits) }}") + 2))
echo "depth=$depth" >> $GITHUB_ENV