ci/linux: disable leak detector temporarily

After libass update our jobs started failing. It has been fixed upstream
already, but we need to wait for next stable release to have that.

See: 6e83137cdb

.github/workflows/build.yml

@@ -288,6 +288,7 @@ jobs:
       env:
         CC: "${{ matrix.config.cc }}"
         CXX: "${{ matrix.config.cxx }}"
+        ASAN_OPTIONS: "halt_on_error=1:abort_on_error=1:print_summary=1:detect_leaks=0"
     strategy:
       matrix:
         config: