Use caching in Github Actions Workflow.

.github/actions/setup-python-env/action.yml

@@ -1,14 +1,45 @@
-name: Setup Python env
+name: Setup Python Environment
 description: Install Python & Hatch
 
+inputs:
+  python-version:
+    description: "Version of Python to use for testing"
+    required: false
+    default: "3.9"
+
 runs:
   using: "composite"
+
   steps:
-  - name: Set up Python 3.9
+  - name: Set Linux Release Environment Variable
+    shell: bash
+    run: echo "LINUX_RELEASE=$(lsb_release -rs)" >> $GITHUB_ENV
+  - name: Set up Python ${{ inputs.python_version }}
     uses: actions/setup-python@v4
     with:
-      python-version: "3.9"
+      python-version: "${{ inputs.python-version }}"
+
+  # Cache the dependencies installed by Hatch so that we don't need to reinstall them on every run.
+  - uses: actions/cache@v3
+    with:
+      # Save pip cache.
+      # Save Hatch environments.
+      # Save the package cache for Hatch.
+      # Save pre-commit environments.
+      path: |
+        ${{ env.pythonLocation }}
+        ~/.cache/pip
+        ~/.local/share/hatch
+        ~/.cache/hatch
+        ~/.cache/pre-commit
+      # >- means combine all lines to a single line
+      # The cache key can be any string. The format used here is just for readability.
+      key: >-
+        python_location: "${{ env.pythonLocation }}" AND
+        pyproject_hash: "${{ hashFiles('pyproject.toml') }}" AND
+        precommit_config_hash: "${{ hashFiles('.pre-commit-config.yaml') }}" AND
+        linux_release: "${{ env.LINUX_RELEASE }}"
 
   - name: Install Hatch
     shell: bash
-    run: pip3 install hatch
+    run: pip3 install hatch

.github/workflows/ci-pre-commit.yaml

@@ -15,7 +15,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - uses: ./.github/actions/setup-python-env
+      - name: Setup Python 3.9 Environment
+        uses: ./.github/actions/setup-python-env
+        with:
+          python-version: 3.9
       # This step is necessary so long as we're allowing Pydantic 1 and Pydantic 2 via shimming
       - name: Force Pydantic 1
         run: hatch run dev-env:pip install "pydantic~=1.10"

.github/workflows/ci-pytest.yaml

@@ -20,13 +20,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v4
+      - name: Setup Python ${{ matrix.python-version }} Environment
+        uses: ./.github/actions/setup-python-env
         with:
           python-version: ${{ matrix.python-version }}
-      - name: Install Hatch
-        shell: bash
-        run: pip3 install hatch
       - name: Set pydantic Version ~= ${{ matrix.pydantic-version }}
         run: hatch run dev-env:pip install "pydantic~=${{ matrix.pydantic-version }}"
       - name: Run Python Tests