Remove useless and large /bin after build

BtbN · BtbN · commit d62e6101b535 · 2020-09-20T00:47:38.000+02:00
diff --git a/images/base/run_stage.sh b/images/base/run_stage.sh
@@ -3,3 +3,4 @@ set -xe
 source /stage.sh
 ffbuild_dockerbuild
 rm /stage.sh
+rm -rf "$FFBUILD_PREFIX"/bin
