add dockerfile

add make commands for building and running using docker

remove localhost on server address so it's not locked

Dockerfile

@@ -0,0 +1,12 @@
+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 go build -a -installsuffix cgo \
+    -ldflags="-w -s" -trimpath -o survey ./cmd/survey/
+
+FROM gcr.io/distroless/static-debian13
+COPY --from=builder /app/survey /survey
+EXPOSE 8080
+ENTRYPOINT ["/survey"]