changed Dockerfile.aarch64 build for rootfs-stage

Dockerfile.aarch64

@@ -22,12 +22,17 @@ RUN \
 # build rootfs
 RUN \
   mkdir -p "${ROOTFS}/etc/apk" && \
+  cp -a /etc/apk/keys "${ROOTFS}/etc/apk/" && \
   { \
     echo "${MIRROR}/${REL}/main"; \
     echo "${MIRROR}/${REL}/community"; \
   } > "${ROOTFS}/etc/apk/repositories" && \
-  apk --root "${ROOTFS}" --no-cache --keys-dir /etc/apk/keys add --arch ${ARCH} --initdb ${PACKAGES//,/ } && \
-  sed -i -e 's/^root::/root:!:/' /root-out/etc/shadow
+  apk --root "${ROOTFS}" \
+      --no-cache \
+      --arch ${ARCH} \
+      --initdb \
+      add ${PACKAGES//,/ } && \
+  sed -i -e 's/^root::/root:!:/' "${ROOTFS}/etc/shadow"
 
 # add s6 overlay
 ADD https://github.com/just-containers/s6-overlay/releases/download/v${S6_OVERLAY_VERSION}/s6-overlay-noarch.tar.xz /tmp