gh: setup cbmc

Author: rurban

.github/workflows/minor.yml

@@ -31,6 +31,9 @@ jobs:
           - make examples SANITIZE=1
           - make perf
     steps:
+    - if: ${{ contains(matrix.MAKE, 'SANITIZE=1 O0=1') }}
+      name: setup cbmc
+      run: sudo apt install -y --no-install-recommends cbmc
     # needed for libc++ since the Ubuntu 20.04.2 update (image version 20210315.1)
     # https://askubuntu.com/questions/1211743/clang-doesnt-find-c-stdlib-on-my-ubuntu-18-04-but-it-does-on-a-brand-new-ins
     # variant 1: downgrade clang++ to matching g++ (= 11)