Add workaround for running fuzzers in CI again

.github/workflows/janus-ci.yml

@@ -150,10 +150,15 @@ jobs:
       env:
         JANUS_CONFIG_COMMON: "--disable-docs --enable-post-processing --enable-plugin-lua --enable-plugin-duktape --enable-json-logger"
         JANUS_CONFIG_OPTS: ${{ matrix.janus_config_opts }}
+      # Asan in llvm 14 provided in ubuntu 22.04 is incompatible with
+      # high-entropy ASLR in much newer kernels that GitHub runners are
+      # using leading to random crashes: https://reviews.llvm.org/D148280
       run: |
+        sudo sysctl vm.mmap_rnd_bits=28
         ./autogen.sh
         ./configure $JANUS_CONFIG_COMMON $JANUS_CONFIG_OPTS
-         make -j$(nproc)
+        make -j$(nproc)
+        make check-fuzzers
   javascript-lint:
     runs-on: ubuntu-22.04
     steps: