fix bootstrap image names

src/bootstrap/stage1/Containerfile

@@ -44,7 +44,7 @@ BUILD_KERNELS=False" \
 RUN touch /rootfs/steps/lwext4-1.0.0-lb1/files/fiwix-file-list.txt
 
 FROM scratch as build
-COPY --from=stage0 / .
+COPY --from=stagex/stage0 / .
 COPY --from=config /rootfs .
 ENV ARCH_DIR=x86
 ENV ARCH=x86

src/bootstrap/stage2/Containerfile

@@ -165,7 +165,7 @@ RUN set -eux; \
 FROM build as install
 WORKDIR ${HOME}
 USER 0:0
-COPY --from=stage1 . /rootfs/
+COPY --from=stagex/stage1 . /rootfs/
 RUN set -eux; \
     rm /rootfs/lib; \
     env -C build-musl make DESTDIR=/rootfs/${TARGET} install; \