Fix multi-arch build issue for docker image

Author: tommysitu

Dockerfile

@@ -1,12 +1,20 @@
 FROM golang:1.25.4 AS build-env
 WORKDIR /usr/local/go/src/github.com/SpectoLabs/hoverfly
 COPY . /usr/local/go/src/github.com/SpectoLabs/hoverfly
-RUN cd core/cmd/hoverfly && CGO_ENABLED=0 GOOS=linux go install -ldflags "-s -w"
 
-FROM alpine:latest
-RUN apk --no-cache add ca-certificates
+# Support multi-arch builds with buildx by honoring TARGETOS/TARGETARCH
+ARG TARGETOS=linux
+ARG TARGETARCH
+RUN cd core/cmd/hoverfly \
+    && CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} \
+       go install -ldflags "-s -w"
+
+# Final minimal image based on Alpine, without running apk to avoid QEMU trigger issues
+FROM alpine:3.20
+# Provide CA certificates by copying from the builder (PEM bundle is arch-independent)
+COPY --from=build-env /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+# Copy the statically linked hoverfly binary
 COPY --from=build-env /usr/local/go/bin/hoverfly /bin/hoverfly
-ENTRYPOINT ["/bin/hoverfly", "-listen-on-host=0.0.0.0"]
-CMD [""]
 
+ENTRYPOINT ["/bin/hoverfly", "-listen-on-host=0.0.0.0"]
 EXPOSE 8500 8888