[local] Serve a file from one open handle so Content-Length matches the body - #35

JSONArgsRecommended: JSON arguments recommended for CMD to prevent unintended behavior related to OS signals More info: https://docs.docker.com/go/dockerfile/rule/json-args-recommended/

LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format More info: https://docs.docker.com/go/dockerfile/rule/legacy-key-value-format/

FromAsCasing: 'as' and 'FROM' keywords' casing do not match More info: https://docs.docker.com/go/dockerfile/rule/from-as-casing/