doc: add how to run and dockerfile

Dockerfile

@@ -0,0 +1,21 @@
+FROM docker.io/golang:1.26.1-trixie AS builder
+
+WORKDIR /build
+
+COPY go.mod go.sum .
+
+RUN GOPROXY='https://goproxy.cn,direct' go mod download
+
+COPY cmd ./cmd
+COPY internal ./internal
+
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 \
+        go build -trimpath -ldflags="-s -w" -o /app ./cmd/api
+
+FROM scratch
+WORKDIR /
+
+COPY --from=builder /app /app
+COPY db/ /db
+
+ENTRYPOINT ["/app"]