fix: build with custom kernel/rootfs

Fix ONBUILD initramfs path

Signed-off-by: Serge Logvinov <serge.logvinov@sinextra.dev>

Dockerfile

@@ -499,6 +499,7 @@ RUN apk add --no-cache --update \
     xorriso \
     xz
 ARG TARGETARCH
+ENV TARGETARCH ${TARGETARCH}
 COPY --from=install-artifacts / /
 COPY --from=installer-build /installer /bin/installer
 RUN ln -s /bin/installer /bin/talosctl
@@ -514,10 +515,10 @@ ONBUILD RUN apk add --no-cache --update \
 ONBUILD WORKDIR /initramfs
 ONBUILD ARG RM
 ONBUILD RUN xz -d /usr/install/${TARGETARCH}/initramfs.xz \
-    && cpio -idvm < /usr/install/initramfs \
+    && cpio -idvm < /usr/install/${TARGETARCH}/initramfs \
     && unsquashfs -f -d /rootfs rootfs.sqsh \
     && for f in ${RM}; do rm -rfv /rootfs$f; done \
-    && rm /usr/install/initramfs \
+    && rm /usr/install/${TARGETARCH}/initramfs \
     && rm rootfs.sqsh
 ONBUILD COPY --from=customization / /rootfs
 ONBUILD RUN find /rootfs \

website/content/docs/v0.11/Guides/customizing-the-kernel.md

@@ -31,7 +31,7 @@ FROM scratch AS customization
 COPY --from=<custom kernel image> /lib/modules /lib/modules
 
 FROM ghcr.io/talos-systems/installer:latest
-COPY --from=<custom kernel image> /boot/vmlinuz /usr/install/vmlinuz
+COPY --from=<custom kernel image> /boot/vmlinuz /usr/install/${TARGETARCH}/vmlinuz
 ```
 
 When building the image, the `customization` stage will automatically be copied into the rootfs.