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Signed-off-by: Devin Buhl <devin@buhl.casa>
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fixes #207
Add
compression,compression-level, andforce-compressioninputs to the build and bake workflows. Each input sets the attribute of the same name on the BuildKit image exporter. The prepare job makes sure thatcompressionisuncompressed,gzip,estargz, orzstd, and thatcompression-levelcontains only digits. Because of this, the inputs cannot add other attributes to the exporter. The inputs apply only tooutput: image. Foroutput: local, the workflow ignores valid values and logs a warning.The new test jobs build
test/compression.Dockerfile, which keeps the gzip base layer of alpine. Ifforce-compressiondoes not convert that layer, the test fails. These jobs push only on events other thanpull_request, so I ran the same builds from my fork: https://github.com/onedr0p/github-builder/actions/runs/41712959010. I turned off signing there, because the signing step expects the identity of this repository. Withforce-compression, all layers were zstd. Without it, the alpine layer stayed gzip. With the default values, all layers stayed gzip.