Install wget to fix image build (#231)

### What this PR does / why we need it?

Install `wget` to fix image build

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
CI passed

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Signed-off-by: Yikun Jiang <yikunkero@gmail.com>

Dockerfile

@@ -23,7 +23,7 @@ ARG PIP_INDEX_URL="https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple"
 ENV DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update -y && \
-    apt-get install -y python3-pip git vim net-tools && \
+    apt-get install -y python3-pip git vim wget net-tools && \
     rm -rf /var/cache/apt/* && \
     rm -rf /var/lib/apt/lists/*