Allow bootstrap feature on CI

Signed-off-by: Fabio Utzig <utzig@apache.org>
diff --git a/scripts/run_tests.sh b/scripts/run_tests.sh
index 58d1998..2f63166 100755
--- a/scripts/run_tests.sh
+++ b/scripts/run_tests.sh
@@ -17,7 +17,7 @@
 EXIT_CODE=0
 
 if [[ ! -z $SINGLE_FEATURES ]]; then
-  all_features="sig-rsa sig-ecdsa overwrite-only validate-slot0 enc-rsa enc-kw"
+  all_features="sig-rsa sig-ecdsa overwrite-only validate-slot0 enc-rsa enc-kw boostrap"
 
   if [[ $SINGLE_FEATURES =~ "none" ]]; then
     echo "Running cargo with no features"