Run Lean Python regression tests job on self-hosted runner

Follow the pattern of Lean's own regression tests CI job: 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-regression-tests.yml

@@ -18,8 +18,10 @@ concurrency:
 
 jobs:
   lean-python-regression:
-    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
@@ -32,41 +34,19 @@ 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: Restrict regression tests to Python only
@@ -75,12 +55,12 @@ jobs:
           # key (defaults to CSharp + Python). Setting it to Python only makes the
           # test factory emit Python test cases exclusively. The config file is
           # JSONC; Newtonsoft tolerates the inserted line.
-          runInContainer sed -i '1a\  "regression-test-languages": ["Python"],' \
+          sed -i '1a\  "regression-test-languages": ["Python"],' \
             Lean/Tests/bin/Release/config.json
 
       - name: Run Lean Python regression 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 \
             --filter "TestCategory=RegressionTests & Name~Python/" \
             -- TestRunParameters.Parameter\(name=\"log-handler\", value=\"ConsoleErrorLogHandler\"\) \