Update Dockerfile

Dockerfile

@@ -1,9 +1,9 @@
 FROM golang:1.22 AS builder
 WORKDIR /go/src/github.com/missuo
 RUN git clone https://github.com/missuo/FreeDuckDuckGo.git
-COPY /FreeDuckDuckGo/main.go ./
-COPY /FreeDuckDuckGo/go.mod ./
-COPY /FreeDuckDuckGo/go.sum ./
+COPY ./FreeDuckDuckGo/main.go ./
+COPY ./FreeDuckDuckGo/go.mod ./
+COPY ./FreeDuckDuckGo/go.sum ./
 RUN go get -d -v ./
 RUN CGO_ENABLED=0 go build -a -installsuffix cgo -o FreeDuckDuckGo .