Update apk repo for kexec-tools

kexec-tools has been promoted from edge/testing to edge/community

Author: sirhopcount

hook-docker/Dockerfile

@@ -4,7 +4,7 @@ WORKDIR /src
 RUN CGO_ENABLED=0 go build -a -ldflags '-w -extldflags "-static"' -o /hook-docker
 
 FROM docker:24.0.4-dind
-RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories
+RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories
 RUN apk update; apk add kexec-tools
 COPY --from=dev /hook-docker .
 ENTRYPOINT ["/hook-docker"]