Use alpine as base image for building simd. (#4067)

Co-authored-by: Carlos Rodriguez <carlos@interchain.io>

Dockerfile

@@ -1,18 +1,16 @@
-FROM golang:1.20 as builder
-
+FROM golang:1.20-alpine3.18 as builder
 ARG IBC_GO_VERSION
 
+RUN set -eux; apk add --no-cache git libusb-dev linux-headers gcc musl-dev make;
+
 ENV GOPATH=""
 ENV GOMODULE="on"
 
 # ensure the ibc go version is being specified for this image.
 RUN test -n "${IBC_GO_VERSION}"
 
-COPY go.mod .
-COPY go.sum .
-
-RUN go mod download
-
+# Copy relevant files before go mod download. Replace directives to local paths break if local
+# files are not copied before go mod download.
 ADD internal internal
 ADD testing testing
 ADD modules modules
@@ -21,15 +19,19 @@ ADD LICENSE LICENSE
 COPY contrib/devtools/Makefile contrib/devtools/Makefile
 COPY Makefile .
 
+COPY go.mod .
+COPY go.sum .
 
-RUN make build
+RUN go mod download
 
-FROM ubuntu:22.04
+RUN BUILD_TAGS=muslc make build
 
+FROM alpine:3.18
 ARG IBC_GO_VERSION
 
 LABEL "org.cosmos.ibc-go" "${IBC_GO_VERSION}"
 
 COPY --from=builder /go/build/simd /bin/simd
 
 ENTRYPOINT ["simd"]
+