add GitHub Actions workflow and Dockerfile for building and pushing container image

Dockerfile

@@ -0,0 +1,33 @@
+# build
+FROM reg.liteyuki.org/dockerhub/golang:1.24.2-alpine3.21 AS builder
+
+ENV TZ=Asia/Chongqing
+
+WORKDIR /app
+
+RUN apk --no-cache add build-base git tzdata
+
+COPY go.mod go.sum ./
+
+RUN go mod download
+
+COPY . .
+
+RUN go build -o main main.go
+
+# production
+FROM reg.liteyuki.org/dockerhub/alpine:latest AS prod
+
+ENV TZ=Asia/Chongqing
+
+WORKDIR /app
+
+RUN apk --no-cache add tzdata ca-certificates libc6-compat libgcc libstdc++
+
+COPY --from=builder /app/main /app/main
+
+EXPOSE 8888
+
+RUN chmod +x ./main
+
+ENTRYPOINT ["./main"]