Rewrite makefile to use out/ dir

docker/itb.Dockerfile

@@ -10,11 +10,11 @@ ARG DEVICE_TREE_TARGET
 RUN mkdir /image
 WORKDIR /image
 
-COPY --from=kernel /out/kernel/Image.gz ./Image.gz
-COPY --from=kernel /out/kernel/System.map ./
-COPY --from=kernel /out/kernel/.config ./
-COPY --from=fit /out/initramfs.cpio.gz ./
-COPY --from=kernel /out/${DEVICE_TREE_TARGET}.dtb ./
+COPY [ "./out/Image.gz" \
+	, "./out/System.map" \
+	, "./out/.config" \
+	, "./out/initramfs.cpio.gz" \
+	, "./out/${DEVICE_TREE_TARGET}.dtb", "./" ]
 
 COPY ./board.its ./_board.its