build: pass module proxy to docker builder

Dockerfile

@@ -1,8 +1,24 @@
 FROM golang:1.23-alpine AS builder
 
+ARG GOPROXY=https://proxy.golang.org,direct
+ARG HTTP_PROXY
+ARG HTTPS_PROXY
+ARG NO_PROXY
+ARG http_proxy
+ARG https_proxy
+ARG no_proxy
+
+ENV GOPROXY=${GOPROXY} \
+    HTTP_PROXY=${HTTP_PROXY} \
+    HTTPS_PROXY=${HTTPS_PROXY} \
+    NO_PROXY=${NO_PROXY} \
+    http_proxy=${http_proxy} \
+    https_proxy=${https_proxy} \
+    no_proxy=${no_proxy}
+
 WORKDIR /src
 COPY go.mod go.sum* ./
-RUN go mod download || true
+RUN go mod download
 COPY . .
 RUN CGO_ENABLED=0 GOOS=linux go build -o /out/app ./cmd/app \
  && CGO_ENABLED=0 GOOS=linux go build -o /out/backfill ./cmd/backfill