add docker

Dockerfile

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+FROM golang:1.25.6-alpine AS builder
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -installsuffix cgo -ldflags="-s -w" -o main ./cmd/api
+FROM scratch
+
+COPY --from=builder /app/main /main
+
+EXPOSE 8080
+ENTRYPOINT ["/main"]