Fixing UNIX sockets error

The current temporary path under which UNIX sockets are created gets too long (more than 10 chars) which causes tests to fail with an "AF_UNIX path too long" error. This is fixed by specifying `$TMPDIR` to be a shorter path.

Author: elicn

.github/workflows/build-ci.yml

@@ -70,6 +70,7 @@ jobs:
       if: contains(matrix.os, 'ubuntu')
       shell: 'script -q -e -c "bash {0}"'
       run: |
+        export TMPDIR=/tmp
         cd examples
         rm -rf rootfs
         wget https://github.com/qilingframework/rootfs/archive/refs/heads/master.zip