br: security update br image:1.18.1-alpine to 1.18.9-alpine (#40863) (#…

…41390)

ref #39052

br/docker/Dockerfile

@@ -1,5 +1,6 @@
 # For loading data to TiDB
-FROM golang:1.18-buster as go-ycsb-builder
+
+FROM golang:1.18.9-alpine as go-ycsb-builder
 WORKDIR /go/src/github.com/pingcap/
 RUN git clone https://github.com/pingcap/go-ycsb.git --depth=1 && \
     cd go-ycsb && \
@@ -8,15 +9,7 @@ RUN git clone https://github.com/pingcap/go-ycsb.git --depth=1 && \
 # For operating minio S3 compatible storage
 FROM minio/mc as mc-builder
 
-FROM golang:1.18-buster
-
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    git \
-    curl \
-    vim \
-    less \
-    default-mysql-client \
-    && rm -rf /var/lib/apt/lists/*
+FROM golang:1.18.9-alpine
 
 WORKDIR /go/src/github.com/pingcap/br
 COPY . .