Update Dockerfile

Dockerfile

@@ -6,11 +6,9 @@ ENV TZ=Asia/Shanghai
 
 WORKDIR /app
 
-# Install git
-RUN apt-get update && apt-get install -y git
-
-# Clone the repository
-RUN git clone https://github.com/Chenyme/oaifree-tools.git /app && \
+# 安装git，克隆仓库，然后移除git以减小镜像体积
+RUN apk add --no-cache git && \
+    git clone https://github.com/Chenyme/oaifree-tools.git /app && \
     apk del git
 
 # Install dependencies