Add Python 3.8 to GitHub CI workflow

.github/workflows/ci.yml

@@ -17,9 +17,9 @@ jobs:
       shell: powershell
       run: |
         $wc = New-Object System.Net.WebClient
-        $wc.DownloadFile("https://www.panda3d.org/download/panda3d-1.10.4.1/panda3d-1.10.4.1-tools-win64.zip", "thirdparty-tools.zip")
+        $wc.DownloadFile("https://www.panda3d.org/download/panda3d-1.10.5/panda3d-1.10.5-tools-win64.zip", "thirdparty-tools.zip")
         Expand-Archive -Path thirdparty-tools.zip
-        Move-Item -Path thirdparty-tools/panda3d-1.10.4.1/thirdparty -Destination .
+        Move-Item -Path thirdparty-tools/panda3d-1.10.5/thirdparty -Destination .
     - name: Get thirdparty packages (macOS)
       if: runner.os == 'macOS'
       run: |
@@ -28,6 +28,18 @@ jobs:
         mv panda3d-1.10.5/thirdparty thirdparty
         rmdir panda3d-1.10.5
         (cd thirdparty/darwin-libs-a && rm -rf rocket)
+    - name: Set up Python 3.8
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.8
+    - name: Build Python 3.8
+      run: |
+        python makepanda/makepanda.py --git-commit=${{github.sha}} --outputdir=built --everything --no-eigen --python-incdir=$pythonLocation/include --python-libdir=$pythonLocation/lib --verbose --threads=4
+    - name: Test Python 3.8
+      shell: bash
+      run: |
+        python -m pip install pytest
+        PYTHONPATH=built LD_LIBRARY_PATH=built/lib DYLD_LIBRARY_PATH=built/lib python -m pytest
     - name: Set up Python 3.7
       uses: actions/setup-python@v1
       with: