add files

Dockerfile.multistage

@@ -0,0 +1,26 @@
+FROM golang:1.25.3 AS build-stage
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+
+RUN go mod download
+
+COPY *.go ./
+
+RUN CGO_ENABLED=0 GOOS=linux go build -o /srv.bin
+
+from build-stage AS run-tests-stage
+RUN go test -v ./
+
+FROM gcr.io/distroless/base-debian11 AS build-release-stage
+
+WORKDIR /
+
+COPY --from=build-stage /srv.bin /srv.bin
+
+EXPOSE 8080/tcp
+
+USER nonroot:nonroot
+
+ENTRYPOINT ["/srv.bin"]