Cache envs for faster github actions (#291)

* Cache pip for faster actions

* Add caching to viewer

* Fix Path

* typo

* try path again

* Fancier caching

.github/workflows/core_code_checks.yml

@@ -16,14 +16,16 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python 3.8.12
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v4
         with:
           python-version: '3.8.12'
+      - uses: actions/cache@v2
+        with:
+          path: ${{ env.pythonLocation }}
+          key: ${{ env.pythonLocation }}-${{ hashFiles('setup.py') }}-${{ hashFiles('dev-requirements.txt') }}
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip
-          pip install -r environment/requirements.txt
-          pip install -e .
+          pip install --upgrade --upgrade-strategy eager -r environment/requirements.txt -e .
       - name: Run license checks
         run: |
           ./scripts/licensing/license_headers.sh --check