build: 加入 Dockerfile

Dockerfile

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+FROM golang:alpine as builder
+
+RUN go env -w CGO_ENABLED=0
+
+WORKDIR /build
+
+COPY . .
+
+RUN go build -ldflags '-extldflags "-static"' -o runner
+
+FROM alpine:latest
+
+RUN apk update && \
+    apk upgrade --no-cache && \
+    apk add --no-cache tzdata && \
+    cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && \
+    echo 'Asia/Shanghai' >/etc/timezone && \
+    rm -rf /var/cache/apk/*
+
+COPY --from=builder /build/runner /usr/bin/runner
+RUN chmod +x /usr/bin/runner
+
+WORKDIR /data
+
+ENTRYPOINT [ "/usr/bin/runner" ]