Temporarily enable backtraces in CI

GabrielMajeri · GabrielMajeri · commit a8eb5269889c · 2019-10-31T19:52:53.000+02:00
diff --git a/ci/all.sh b/ci/all.sh
@@ -6,6 +6,8 @@ set -ex
 
 : "${1?The all.sh script requires one argument.}"
 
+export RUST_BACKTRACE=1
+
 op=$1
 
 cargo_clean() {
