Run Lean Python unit tests job on self-hosted runner

Follow the pattern of Lean's own unit test CI job and this repo's main
workflow: run directly in a quantconnect/lean:foundation container on a
self-hosted runner instead of manually managing a docker container on a
GitHub-hosted runner.

Author: jhonabreul

.github/workflows/lean-python-unit-tests.yml

@@ -5,7 +5,8 @@ name: Lean Python Unit Tests
 # Lean unit test class that exercises Python code. We build this repo's
 # Python.Runtime.dll, build Lean against its NuGet QuantConnect.pythonnet
 # reference, drop the freshly built DLL over Lean's test output, and run only
-# the test classes whose sources reference the Python interop layer.
+# the test classes whose sources reference the Python interop layer,
+# mirroring Lean's own .github/workflows/gh-actions.yml unit test job.
 
 on:
   push:
@@ -19,8 +20,10 @@ concurrency:
 
 jobs:
   lean-python-unit-tests:
-    runs-on: ubuntu-24.04
-    timeout-minutes: 360
+    runs-on: self-hosted
+    container:
+        image: quantconnect/lean:foundation
+        options: --cpus 12 --memory 12g
     steps:
       - name: Checkout pythonnet
         uses: actions/checkout@v4
@@ -33,41 +36,19 @@ jobs:
           repository: QuantConnect/Lean
           path: Lean
 
-      - name: Liberate disk space
-        uses: jlumbroso/free-disk-space@main
-        with:
-          tool-cache: true
-          large-packages: false
-          docker-images: false
-          swap-storage: false
-
-      - name: Define docker helper
-        run: |
-          echo 'runInContainer() { docker exec test-container "$@"; }' > $HOME/ci_functions.sh
-          echo "BASH_ENV=$HOME/ci_functions.sh" >> $GITHUB_ENV
-
-      - name: Start container
-        run: |
-          docker run -d \
-            --workdir /__w/pythonnet/pythonnet \
-            -v /home/runner/work:/__w \
-            --name test-container \
-            quantconnect/lean:foundation \
-            tail -f /dev/null
-
       - name: Build Python.Runtime.dll
         run: |
-          runInContainer dotnet build pythonnet/src/runtime/Python.Runtime.csproj \
+          dotnet build pythonnet/src/runtime/Python.Runtime.csproj \
             -c Release /v:quiet /p:WarningLevel=1
 
       - name: Build Lean
         run: |
-          runInContainer dotnet build /p:Configuration=Release /v:quiet /p:WarningLevel=1 \
+          dotnet build /p:Configuration=Release /v:quiet /p:WarningLevel=1 \
             Lean/QuantConnect.Lean.sln
 
       - name: Inject freshly built Python.Runtime.dll into Lean test output
         run: |
-          runInContainer cp pythonnet/pythonnet/runtime/Python.Runtime.dll \
+          cp pythonnet/pythonnet/runtime/Python.Runtime.dll \
             Lean/Tests/bin/Release/Python.Runtime.dll
 
       - name: Generate Python unit test filter
@@ -105,6 +86,6 @@ jobs:
 
       - name: Run Lean Python unit tests
         run: |
-          runInContainer dotnet test Lean/Tests/bin/Release/QuantConnect.Tests.dll \
+          dotnet test Lean/Tests/bin/Release/QuantConnect.Tests.dll \
             --blame-hang-timeout 300seconds --blame-crash \
             --settings lean-python-unit-tests.runsettings