FROM docker.io/alpine:latest as downloader

RUN apk add -U --no-cache curl jq && \
	export KO_VERSION=$(curl https://api.github.com/repos/ko-build/ko/releases | jq -r '. | first |.tag_name | capture("(?<version>[[:digit:]]+\\.[[:digit:]]+\\.[[:digit:]]+)") | .version') && \
	curl -L "https://github.com/ko-build/ko/releases/download/v${KO_VERSION}/ko_${KO_VERSION}_Linux_x86_64.tar.gz" | tar xvz -C /tmp

FROM docker.io/golang:1.21-bullseye as final

COPY --from=downloader /tmp/ko /usr/local/bin/ko