test: Remove kernel-compile from kmod test
linuxkit/kernel-compile is no longer maintained. Use
the alpine base image instead.
FROM linuxkit/kernel:4.9.46 AS ksrc
# Extract headers and compile module
-FROM linuxkit/kernel-compile:1b396c221af673757703258159ddc8539843b02b@sha256:6b32d205bfc6407568324337b707d195d027328dbfec554428ea93e7b0a8299b AS build
+FROM linuxkit/alpine:f4f5b333fa1a8433334fcae996d1637173144a72 AS build
+RUN apk add build-base
+
COPY --from=ksrc /kernel-dev.tar /
RUN tar xf kernel-dev.tar
