add pprof handler

Dockerfile

@@ -1,11 +1,12 @@
 FROM docker.io/library/golang:1.24-alpine
 ARG  GOPROXY=direct
+ARG  TAGS=""
 ARG  ALPINE_MIRROR=https://mirrors.ustc.edu.cn
 WORKDIR /src
 COPY go.mod go.sum ./
 RUN  sed -i "s,https://dl-cdn.alpinelinux.org,${ALPINE_MIRROR}," /etc/apk/repositories; apk add git && env GOPROXY=${GOPROXY:-direct} go mod download
 ADD . /src
-RUN  go build -o /cache-proxy ./cmd/proxy
+RUN  go build -o /cache-proxy -tags "${TAGS}" ./cmd/proxy
 
 FROM docker.io/library/alpine:3.21 AS runtime
 COPY --from=0 /cache-proxy /bin/cache-proxy