Add CI workflow to optimize PNG images with oxipng#1936
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Runs on push to main/prerelease when PNG files change. Optimizes images with oxipng and commits them back.
SHA-pinning prevents supply chain attacks on actions with write permissions. v46 to v47 is dependency bumps only.
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📝 Preview Deployment🔍 Full site preview: https://deploy-preview-1936.quarto.org |
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An idea I wanted to do for a long time to reduce size of this repo, and especially images.
PNG images added to the repo are not optimized, leading to unnecessarily large files. This adds a GitHub Actions workflow that automatically optimizes PNG images using oxipng whenever they land on
mainorprerelease.How it works
On push to
main/prereleasewith**/*.pngchanges:oxipng -o 4 -i 0 --strip safe(lossless compression, remove interlacing, strip safe metadata)stefanzweifel/git-auto-commit-actionRuns post-merge rather than on PRs, so it works for fork contributions too. The existing
port-to-prereleaseworkflow handles syncing to prerelease, where this workflow runs independently.No infinite loop risk: commits via
GITHUB_TOKENdon't re-trigger workflows. As a secondary safeguard, oxipng is deterministic — re-optimizing an already-optimized image produces no diff.Also pins
tj-actions/changed-filesto a commit SHA in both this workflow andpreview.yml, and upgrades it from v46.0.5 to v47.0.5 (dependency bumps only). SHA-pinning mitigates supply chain risk for actions with write permissions.