deterministic docker support

Dockerfile

@@ -1,13 +1,24 @@
-FROM local/stage0 as stage0
-
-FROM debian as fetch
-RUN apt update && apt install -y curl gcc
-ADD . live-bootstrap
-WORKDIR live-bootstrap
-RUN ./download-distfiles.sh
-RUN mv target/ /rootfs/
-
 FROM scratch as build
-COPY --from=fetch /rootfs .
-ENV PATH=/bin
+ADD target/ /
 RUN ["/bootstrap-seeds/POSIX/x86/kaem-optional-seed"]
+
+FROM build as install
+ENV PATH=/bin:/usr/sbin:/usr/bin
+RUN set -eux; \
+    rm -rf /usr/lib/python*/__pycache__; \
+    mkdir -p /rootfs/etc /rootfs/home/user; \
+    cp -R $(ls -d /etc/* | grep -v '\(resolv.conf\|hosts\)') /rootfs/etc/; \
+    cp -R lib usr bin var /rootfs/; \
+    echo "user:x:1000:" > /rootfs/etc/group; \
+    echo "user:x:1000:1000::/home/user:/bin/bash" > /rootfs/etc/passwd; \
+    find /rootfs -exec touch -hcd "@0" "{}" +
+
+FROM scratch as package
+COPY --from=install /rootfs /
+USER 1000:1000
+ENTRYPOINT ["/bin/bash"]
+ENV TZ=UTC
+ENV LANG=C.UTF-8
+ENV SOURCE_DATE_EPOCH=1
+ENV KCONFIG_NOTIMESTAMP=1
+ENV PS1="bootstrap$ "