ci: work around min CMake version in Tarantool

Compatibility with CMake < 3.5 has been removed from CMake.
Add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.

Author: locker

.github/workflows/test_on_push.yaml

@@ -27,7 +27,7 @@ jobs:
 
       - name: Install requirements for community
         run: |
-          cmake -S . -B build
+          cmake -S . -B build -DCMAKE_POLICY_VERSION_MINIMUM=3.5
           make -C build bootstrap
 
       # This server starts and listen on 8084 port that is used for tests