Fix: run on-push actions in pull requests from third-party repos (#2505)

The 'on-push' GH actions are not executed (within the context of main
netlab repo) if the pull request comes from another repository, so we
don't know whether they would pass.

This change brings mypy and transformation tests back to the 'on-pull'
workflow, but hopefully executes them only if the source repo is not
'ipspace/netlab'

Author: ipspace

.github/workflows/t-pull.yml

@@ -23,6 +23,19 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install -r requirements.txt -r requirements-dev.txt
+    - name: Run Mypy
+      if: ${{ github.repository != 'ipspace/netlab' }}
+      run: |
+        set -e
+        mypy -p netsim
+        for file in netsim/extra/*/plugin.py; do
+          python3 -m mypy $file
+        done
+    - name: Run transformation tests
+      if: ${{ github.repository != 'ipspace/netlab' }}
+      run: |
+        cd tests
+        PYTHONPATH="../" pytest
     - name: Check integration tests
       run: |
         cd tests