Bootstrap alpine

[nicholasdille]

#syntax=docker/dockerfile:1.6.0

FROM ghcr.io/uniget-org/tools/apk:main AS apk

FROM ubuntu:22.04 AS bootstrap
COPY --from=apk / /
WORKDIR /tmp/target
RUN <<EOF
/usr/local/bin/apk \
    --arch x86_64 \
    -X http://dl-cdn.alpinelinux.org/alpine/latest-stable/main/ \
    -U \
    --allow-untrusted \
    --root /tmp/target \
    --initdb \
    add alpine-base
EOF

FROM scratch
COPY --from=bootstrap /tmp/target /
RUN <<EOF
setup-apkrepos -f
EOF
CMD ["/bin/sh"]