DEBUG with tmate

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

.github/workflows/main.yml

@@ -40,6 +40,7 @@ jobs:
     - name: prepare libc6 for actions
       if: matrix.vector.jobname == 'linux32'
       run: apt -q update && apt -q -y install libc6-amd64 lib64stdc++6
+    - uses: mxschmitt/action-tmate/detached@v3
     - name: install git in container
       run: |
         if command -v git