chore: Modify Dockerfile to speed up docker build speed.

Dockerfile

@@ -3,9 +3,11 @@ FROM python:3.11-alpine
 WORKDIR /app
 COPY . .
 
-# Check If in Github Actions, if not, change Alpine source to Aliyun
+# Check if in Github Actions, if not, change Alpine source to Aliyun
 ARG GITHUB_ACTIONS
-RUN if [ -z "$GITHUB_ACTIONS" ]; then sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories; fi
+RUN if [ "$GITHUB_ACTIONS" != "true" ]; then \
+        sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories; \
+    fi
 
 # Install dependencies
 RUN apk add --no-cache bash build-base libffi-dev openssl-dev
@@ -14,4 +16,3 @@ RUN pip install --no-cache-dir -r requirements.txt -i https://mirrors.ustc.edu.c
 RUN chmod +x ./scripts/*.sh
 
 CMD ["/bin/sh", "./scripts/run.sh"]
-