dockerfile: use ADD to clone repo

Author: crazy-max

Dockerfile

@@ -8,14 +8,13 @@ ARG XX_VERSION=1.4.0
 ARG GO_VERSION=1.21
 
 FROM --platform=${BUILDPLATFORM:-linux/amd64} tonistiigi/xx:${XX_VERSION} AS xx
-FROM --platform=${BUILDPLATFORM:-linux/amd64} golang:${GO_VERSION}-alpine AS builder
-RUN apk --update --no-cache add file git
+FROM --platform=${BUILDPLATFORM:-linux/amd64} golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS builder
+RUN apk --update --no-cache add file
 COPY --from=xx / /
 WORKDIR /src
 ARG CLOUDFLARED_VERSION
-RUN git clone --branch ${CLOUDFLARED_VERSION} https://github.com/cloudflare/cloudflared .
+ADD "https://github.com/cloudflare/cloudflared.git#${CLOUDFLARED_VERSION}" .
 ARG TARGETPLATFORM
-ENV GO111MODULE=on
 ENV CGO_ENABLED=0
 RUN xx-go build -v -mod=vendor -trimpath -o /bin/cloudflared \
     -ldflags="-w -s -X 'main.Version=${CLOUDFLARED_VERSION}' -X 'main.BuildTime=${BUILD_DATE}'" \