ci: fix dockerfile

Signed-off-by: Henry Gressmann <[email protected]>

Author: explodingcamera

Dockerfile

@@ -1,10 +1,9 @@
-FROM busybox AS downloader
+FROM debian:12-slim AS downloader
 ARG TAR_URL_AMD64
 ARG TAR_URL_ARM64
 
-WORKDIR /app
-
-RUN [ "${TARGETPLATFORM}" = "linux/arm64" ] && export TAR_URL=${TAR_URL_ARM64} || export TAR_URL=${TAR_URL_AMD64} \
+RUN apt-get update && apt-get install -y curl tar
+RUN TAR_URL=$(if [ "${TARGETPLATFORM}" = "linux/arm64" ]; then echo ${TAR_URL_ARM64}; else echo ${TAR_URL_AMD64}; fi) \
     && curl -fsSL $TAR_URL -o /tmp/package.tar.gz \
     && tar -xzf /tmp/package.tar.gz -C /app \
     && chmod +x /app/liwan