Enable ssh

Author: facundominguez

.github/workflows/build.yml

@@ -124,6 +124,9 @@ jobs:
         restore-keys: |
           repo-cache-${{ runner.os }}-nixpkgs-${{ env.cache-version }}-    
 
+    - name: Setup upterm session
+      uses: mxschmitt/action-tmate@v3
+
     - name: Prefetch Stackage snapshot
       shell: bash
       run: |