pkg/bpftrace: push empty image to dockerhub

this way we can work around the fact that get-deps does
not build dependencies architecture specific and therefore
tries to build bpftrace for riscv64
with this change an empty image will be pulled and put into
the debug container on riscv64

other architectures stay the same as before

Signed-off-by: Christoph Ostarek <christoph@zededa.com>

Makefile

@@ -377,7 +377,7 @@ endif
 PKGS_riscv64=pkg/ipxe pkg/mkconf pkg/mkimage-iso-efi pkg/grub     \
              pkg/mkimage-raw-efi pkg/uefi pkg/u-boot pkg/cross-compilers \
 	     pkg/debug pkg/dom0-ztools pkg/gpt-tools pkg/storage-init pkg/mkrootfs-squash \
-	     pkg/bsp-imx pkg/optee-os pkg/recovertpm
+	     pkg/bsp-imx pkg/optee-os pkg/recovertpm pkg/bpftrace
 # alpine-base and alpine must be the first packages to build
 PKGS=pkg/alpine $(PKGS_$(ZARCH))
 # eve-alpine-base is bootstrap image for eve-alpine

pkg/bpftrace/Dockerfile

@@ -2,7 +2,7 @@
 
 # Copyright (c) 2024 Zededa, Inc.
 # SPDX-License-Identifier: Apache-2.0
-FROM lfedge/eve-alpine:1f7685f95a475c6bbe682f0b976f12180b6c8726 AS build
+FROM lfedge/eve-alpine:1f7685f95a475c6bbe682f0b976f12180b6c8726 AS builder
 
 ENV BUILD_PKGS make gcc g++ git perl linux-headers musl-dev cmake zlib-dev bcc-dev libbpf-dev cereal flex bison llvm13-libs llvm13-dev llvm13-static clang-dev clang-static pahole gtest-dev bash
 
@@ -30,11 +30,18 @@ RUN if perl -ne 'exit 1 if (m/^bogomips\s*:\s*(\d+)/i && $1 < 500);' /proc/cpuin
     fi
 
 
-FROM scratch
-COPY --from=build /out/opt/zededa/usr/local/bin/bpftrace-aotrt /usr/bin/bpftrace-aotrt
-COPY --from=build /usr/lib/libbpf.so.0 /usr/lib/libbpf.so.0
-COPY --from=build /usr/lib/libelf.so.1 /usr/lib/libelf.so.1
-COPY --from=build /lib/libz.so.1 /lib/libz.so.1
-COPY --from=build /usr/lib/libbcc_bpf.so.0 /usr/lib/libbcc_bpf.so.0
-COPY --from=build /usr/lib/libstdc++.so.6 /usr/lib/libstdc++.so.6
-COPY --from=build /usr/lib/libgcc_s.so.1 /usr/lib/libgcc_s.so.1
+FROM scratch AS bpftrace-bin
+COPY --from=builder /out/opt/zededa/usr/bin/bpftrace-aotrt /usr/local/bin/bpftrace-aotrt
+COPY --from=builder /usr/lib/libbpf.so.0 /usr/lib/libbpf.so.0
+COPY --from=builder /usr/lib/libelf.so.1 /usr/lib/libelf.so.1
+COPY --from=builder /lib/libz.so.1 /lib/libz.so.1
+COPY --from=builder /usr/lib/libbcc_bpf.so.0 /usr/lib/libbcc_bpf.so.0
+COPY --from=builder /usr/lib/libstdc++.so.6 /usr/lib/libstdc++.so.6
+COPY --from=builder /usr/lib/libgcc_s.so.1 /usr/lib/libgcc_s.so.1
+
+FROM bpftrace-bin AS build-amd64
+FROM bpftrace-bin AS build-arm64
+FROM scratch AS build-riscv64
+
+# hadolint ignore=DL3006
+FROM build-${TARGETARCH} AS build