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Recompress slim layers to gzip before pushing #33

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Merged
richturner merged 1 commit into from
May 8, 2026
Merged

Recompress slim layers to gzip before pushing #33

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10 changes: 9 additions & 1 deletion .github/workflows/postgresql.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -240,8 +240,16 @@ jobs:
regctl image import "ocidir:///tmp/slim-oci:slim" /tmp/slim.tar
rm /tmp/slim.tar

# docker save writes uncompressed layer tarballs (.tar, not .tar.gzip).
# Pushed as-is the slim image lands in the registry larger than the
# un-slimmed base. Recompress layers to gzip in place so the registry
# blob sizes reflect the slim toolkit's actual size win.
regctl image mod "ocidir:///tmp/slim-oci:slim" \
--layer-compress gzip --replace

# Compute the manifest digest locally so we can address the registry push
# by digest URL — no tag is created on Docker Hub.
# by digest URL — no tag is created on Docker Hub. Must happen AFTER the
# mod step: recompressing layers changes layer digests → manifest digest.
DIGEST="$(regctl manifest digest "ocidir:///tmp/slim-oci:slim")"
echo "Slim digest (${{ matrix.arch }}): ${DIGEST}"

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