simple names in bootstrap to rely on build-context

src/bootstrap/stage1/Containerfile

@@ -258,7 +258,7 @@ ADD --checksum=sha256:b3a24de97a8fdbc835b9833169501030b8977031bcb54b3b3ac13740f8
 
 # HACK: stage0 tar is currently incompatible with symlinks and github tgz files
 #FROM base as extract
-#COPY --from=stagex/stage0 . /
+#COPY --from=stage0 . /
 #COPY --from=fetch distfiles/live-bootstrap.tgz .
 #SHELL ["/x86/bin/kaem","--verbose","--strict","--file"]
 #COPY <<-EOF extract.kaem
@@ -277,7 +277,7 @@ RUN echo "" > lrvick-live-bootstrap-fc6eeb6/steps/lwext4-1.0.0-lb1/files/fiwix-f
 
 FROM base as build
 USER 0:0
-COPY --from=stagex/stage0 . /
+COPY --from=stage0 . /
 COPY --from=fetch distfiles external/distfiles
 COPY --from=extract /lrvick-live-bootstrap-fc6eeb6/seed/* .
 COPY --from=extract /lrvick-live-bootstrap-fc6eeb6/steps steps

src/bootstrap/stage2/Containerfile

@@ -61,7 +61,7 @@ ADD --checksum=sha256:${MPC_HASH} ${MPC_SITE} .
 ADD --checksum=sha256:${ISL_HASH} ${ISL_SITE} .
 
 FROM fetch as build
-COPY --from=stagex/stage2 . /
+COPY --from=stage2 . /
 RUN set -eux; \
     tar -xf ${LINUX_FILE}; \
     tar -xzf ${MUSL_FILE}; \
@@ -172,7 +172,7 @@ RUN set -eux; \
 FROM build as install
 WORKDIR ${HOME}
 USER 0:0
-COPY --from=stagex/stage1 . /rootfs/
+COPY --from=stage1 . /rootfs/
 RUN set -eux; \
     rm /rootfs/lib; \
     env -C build-musl make DESTDIR=/rootfs/${TARGET} install; \

src/bootstrap/stage3/Containerfile

@@ -71,7 +71,7 @@ ADD --checksum=sha256:${MPC_HASH} ${MPC_SITE} .
 ADD --checksum=sha256:${ISL_HASH} ${ISL_SITE} .
 
 FROM fetch as build
-COPY --from=stagex/stage2 . /
+COPY --from=stage2 . /
 RUN --network=none <<-EOF
 	set -eux
 	tar -xf ${LINUX_FILE}