Sebagai contoh untuk replikasi issue ini, mari kita buat contoh Dockerfile
FROM fedora:40 as build USER fedora
build dengan CLI docker build . -t fedora-dev1
$ docker build . -t fedora-dev1 [+] Building 3.3s (6/6) FINISHED docker:default => [internal] load build definition from Dockerfile 0.1s => => transferring dockerfile: 73B 0.0s => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 1) 0.1s => [internal] load metadata for docker.io/library/fedora:40 3.0s => [auth] library/fedora:pull token for registry-1.docker.io 0.0s => [internal] load .dockerignore 0.0s => => transferring context: 2B 0.0s => [1/1] FROM docker.io/library/fedora:40@sha256:5ce8497aeea599bf6b54ab3979133923d82aaa4f6ca5ced1812611b197c79eb0 0.0s => exporting to image 0.1s => => exporting layers 0.0s => => writing image sha256:cfee09f0d6073a411f049aa9b7b9793bd0bfbde023de64cf2af02b9bdce2c466 0.0s => => naming to docker.io/library/fedora-dev1 0.0s 1 warning found (use --debug to expand): - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 1)
Solusinya adalah dengan menggunakan huruf kapital untuk keyword bawaan docker, dalam hal ini adalah keyword as menjadi AS
Ubah Dockerfile menjadi
FROM fedora:40 AS build
USER fedoradocker build berhasil