try(ci): add tmate

.github/workflows/ci.yaml

@@ -110,6 +110,8 @@ jobs:
           purge-primary-key: never
       - name: Remove old cache profiles
         run: rm -rf /nix/var/nix/profiles/cache
+      - name: Setup tmate session
+        uses: mxschmitt/action-tmate@v3
       - name: Check template VSCodium
         run: |
           nix profile install template/