Test add different mirror

Author: iluuu1994

.cirrus.yml

@@ -6,7 +6,9 @@ asan_task:
   container:
     image: gcc:latest
   install_script:
-    - apt-get update && apt-get install \
+    - echo 'deb https://debian.ethz.ch/debian stable main' >> /etc/apt/sources.list
+    - apt-get update
+    - apt-get install \
         bison \
         re2c \
         locales \