Specify CGO flags directly for cross compilation on alpine

Author: trengrj

benchmarker/Dockerfile

@@ -1,10 +1,12 @@
 FROM golang:1.22-alpine AS builder
 RUN apk add --no-cache hdf5-dev gcc libc-dev python3 bash g++ musl-dev
+ENV CGO_CFLAGS="-I/usr/include"
+ENV CGO_LDFLAGS="-L/usr/lib -lhdf5 -lhdf5_hl"
 WORKDIR /app
 COPY . .
 RUN CGO_ENABLED=1 go build -o benchmarker .
 
-FROM alpine:latest
+FROM golang:1.22-alpine
 RUN apk add --no-cache hdf5-dev python3 bash
 WORKDIR /app
 COPY --from=builder /app/benchmarker /app/benchmarker