first commit

Dockerfile

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+# Build stage
+FROM golang:1.25-alpine AS builder
+
+WORKDIR /app
+COPY go.mod go.sum* ./
+RUN go mod download 2>/dev/null || true
+
+COPY *.go ./
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-w -s" -o speedtest-server .
+
+# Runtime stage - distroless for minimal attack surface
+FROM gcr.io/distroless/static-debian12:latest-amd64
+
+WORKDIR /
+COPY --from=builder /app/speedtest-server /speedtest-server
+
+EXPOSE 8080
+
+USER nonroot:nonroot
+
+ENTRYPOINT ["/speedtest-server"]