Try caching of pip dependencies so that pip install can be skipped for subsequent builds that don't change dependencies.

Use hash of both dev-requirements.txt and requirements.txt files for cache key.

.github/workflows/contract_tests.yml

@@ -18,13 +18,25 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - name: Set up Python 3.10 and install dependencies
+      - id: setup_python
+        name: Set up Python 3.10 Environment
         uses: actions/setup-python@v4
         with:
           # Semantic version range syntax or exact version of a Python version
           python-version: '3.10'
-          cache: 'pip'  # cache pip dependencies
-      - run: pip install .[dev]
+
+      - id: python_cache
+        name: Retrieve Cached Python Dependencies
+        uses: actions/cache@v3
+        with:
+          path: ${{ env.pythonLocation }}
+          key: ${{ runner.os }}-pip-${{ steps.setup_python.outputs.python-version }}-${{ hashFiles('dev-requirements.txt', 'requirements.txt') }}
+
+      - name: Install Dependencies
+        if: steps.python_cache.outputs.cache-hit != 'true'
+        run: |
+          python -m pip install --upgrade pip
+          pip install .[dev]
 
       - name: Install Solidity Compiler
         run: python ./scripts/installation/install_solc.py

.github/workflows/python_tests.yml

@@ -21,12 +21,24 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - name: Set up Python ${{ matrix.python-version }} and install dependencies
+      - id: setup_python
+        name: Set up Python ${{ matrix.python-version }} Environment
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
-          cache: 'pip'  # cache pip dependencies
-      - run: pip install .[dev]
+
+      - id: python_cache
+        name: Retrieve Cached Python Dependencies
+        uses: actions/cache@v3
+        with:
+          path: ${{ env.pythonLocation }}
+          key: ${{ runner.os }}-pip-${{ steps.setup_python.outputs.python-version }}-${{ hashFiles('dev-requirements.txt', 'requirements.txt') }}
+
+      - name: Install Dependencies
+        if: steps.python_cache.outputs.cache-hit != 'true'
+        run: |
+          python -m pip install --upgrade pip
+          pip install .[dev]
 
       - name: Install Solidity Compiler
         run: python ./scripts/installation/install_solc.py