change CCACHE_MAXSIZE 5G -> 1.5G

Author: zjw1111

ci/scripts/setup_ccache.sh

@@ -18,7 +18,7 @@ echo "PAIMON_USE_CCACHE=ON" >> $GITHUB_ENV
 
 echo "CCACHE_COMPILERCHECK=content" >> $GITHUB_ENV
 echo "CCACHE_DIR=${HOME}/.ccache" >> $GITHUB_ENV
-echo "CCACHE_MAXSIZE=5G" >> $GITHUB_ENV
+echo "CCACHE_MAXSIZE=1500M" >> $GITHUB_ENV
 echo "CCACHE_COMPRESS=true" >> $GITHUB_ENV
 echo "CCACHE_COMPRESSLEVEL=6" >> $GITHUB_ENV