Adding artifact upload support for builds

- Including both bdist_wheel and sdist
- Adding pandoc dependencies

.github/workflows/manylinux2010.yml

@@ -17,10 +17,18 @@ jobs:
     # capnproto build requires cmake 3+, CentOS 6 (manylinux2010) defaults to cmake 2.8
     - name: Install dependencies
       run: |
-        yum install -y cmake3 ninja-build
+        yum install -y cmake3 ninja-build pandoc
         ln -sf /usr/bin/cmake3 /usr/local/bin/cmake
         ln -s /usr/bin/ninja-build /usr/local/bin/ninja
         /opt/python/${{ matrix.python-version }}/bin/python -m pip install -r requirements.txt
     - name: Build pycapnp and install
       run: |
         /opt/python/${{ matrix.python-version }}/bin/python setup.py build
+    - name: Packaging
+      run: |
+        /opt/python/${{ matrix.python-version }}/bin/python setup.py bdist_wheel
+        /opt/python/${{ matrix.python-version }}/bin/python setup.py sdist
+    - uses: actions/upload-artifact@v1.0.0
+      with:
+        name: manylinux2010_dist
+        path: dist