Merge pull request #13 from CMUSTRUDEL/dev

ci: cache pip packages

.github/workflows/release.yml

@@ -36,9 +36,17 @@ jobs:
           ref: gh-pages
           path: docs/build/html
 
+      - name: Cache pip
+        uses: actions/cache@v1
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('setup.py') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+
       - name: Build pages with sphinx
         run: |
-          python3 -m pip install --upgrade pip setuptools
+          python3 -m pip install --upgrade pip setuptools wheel
           # basically, make install_dev but explicitly use pip3
           pip3 install typing sphinx sphinx-autobuild
           if [ -f requirements.txt ]; then pip3 install -r requirements.txt; fi