* guix/scripts/publish.scm (show-help, %options): Add '--cache-bypass-threshold'. (low-compression): New procedure. (cache-bypass-threshold): New parameter. (bypass-cache?): New procedure. (render-narinfo/cached): Call 'render-narinfo' when 'bypass-cache?' returns true. (render-nar/cached): Call 'render-nar' when 'bypass-cache?' returns true. (guix-publish): Parameterize 'cache-bypass-threshold'. * tests/publish.scm ("with cache", "with cache, lzip + gzip") ("with cache, uncompressed"): Pass '--cache-bypass-threshold=0'. ("with cache, vanishing item"): Expect 200 for RESPONSE. ("with cache, cache bypass"): New test.
