Fix an hadolint warning

Author: sprat

Dockerfile

@@ -53,7 +53,7 @@ WORKDIR /out
 ENTRYPOINT ["build-image"]
 
 # =========================================================
-FROM alpine-base AS bootable-alpine-rootfs
+FROM alpine-base AS bootable-alpine
 SHELL ["/bin/ash", "-euxo", "pipefail", "-c"]
 
 # install the alpine-base package (for the user space)
@@ -91,9 +91,6 @@ rc_add boot "$BOOT_SERVICES"; \
 rc_add default "$DEFAULT_SERVICES"; \
 rc_add shutdown "$SHUTDOWN_SERVICES"
 
-# =========================================================
-FROM scratch AS bootable-alpine
-COPY --from=bootable-alpine-rootfs / /
 ENTRYPOINT ["/bin/sh"]
 
 # =========================================================