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Tonis Tiigi
56e4a837eb
Go 1.27 changed compress/flate encoder output in CL 707355 while improving compression speed (golang/go#75532). This changes the bytes of every gzip-compressed layer BuildKit produces, and therefore their digests, breaking cache reuse and content dedup against layers built by earlier BuildKit releases. Vendor the writer half of Go 1.26.5's compress/flate as util/compression/go126flate (verbatim copy of tag go1.26.5, c19862e5f8415b4f24b189d065ed739517c548ba) together with the small amount of gzip framing that image layers use, and route the gzip compressor through it. Output is byte-identical to Go 1.26.5 compress/gzip for all compression levels, so layer digests stay stable regardless of the toolchain BuildKit is built with. Note this only covers the plain gzip compressor; estargz and nydus still use the stdlib encoder. Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>