fix: fix terminal not opening in Docker and slim down Docker image

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Dockerfile.ci

@@ -12,9 +12,6 @@ RUN apt-get update && apt-get install -y \
     curl \
     python3 \
     python3-pip \
-    gcc \
-    g++ \
-    make \
     && rm -rf /var/lib/apt/lists/*
 
 COPY dist/${TARGETARCH}/codeg-server /usr/local/bin/codeg-server
@@ -24,6 +21,7 @@ ENV CODEG_STATIC_DIR=/app/web
 ENV CODEG_DATA_DIR=/data
 ENV CODEG_PORT=3080
 ENV CODEG_HOST=0.0.0.0
+ENV SHELL=/bin/bash
 
 EXPOSE 3080
 VOLUME /data