ci: create composite actions to avoid code repetition (#23)

Author: felix-seifert

.github/actions/prepare-env-composite-action/action.yml

@@ -0,0 +1,51 @@
+name: 'Prepare Environment'
+description: 'Ensure venv exists with necessary Python and Ansible dependencies'
+
+runs:
+  using: "composite"
+
+  steps:
+    - name: Checkout repository
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # SHA for version 5.0.0
+
+    - name: Set up Python
+      id: set_up_python
+      uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # SHA for version 5.6.0
+      with:
+        python-version: "3.12"
+
+    - name: Get environment info
+      id: env_info
+      run: |
+        venv_dir=$(make print-venv-dir)
+        collections_dir=$(make print-ansible-collections-dir)
+        python_reqs_file=$(make print-python-requirements-file)
+        ansible_reqs_file=$(make print-ansible-requirements-file)
+
+        echo "venv_dir=$venv_dir" >> $GITHUB_OUTPUT
+        echo "collections_dir=$collections_dir" >> $GITHUB_OUTPUT
+        echo "python_reqs_file=$python_reqs_file" >> $GITHUB_OUTPUT
+        echo "ansible_reqs_file=$ansible_reqs_file" >> $GITHUB_OUTPUT
+
+        # GitHub’s hashFiles isn’t available here, so use sha256sum
+        echo "python_hash=$(sha256sum $python_reqs_file | cut -d ' ' -f1)" >> $GITHUB_OUTPUT
+        echo "ansible_hash=$(sha256sum $ansible_reqs_file | cut -d ' ' -f1)" >> $GITHUB_OUTPUT
+      shell: bash
+
+    - name: Cache venv
+      uses: actions/cache@0400d5f644dc74513175e3cd8d07132dd4860809 # SHA for version 4.2.4
+      with:
+        key: venv-${{ runner.os }}-${{ steps.set_up_python.outputs.python-version }}-${{ steps.env_info.outputs.python_hash }}
+        path: ${{ steps.env_info.outputs.venv_dir }}
+
+    - name: Cache Ansible collections
+      uses: actions/cache@0400d5f644dc74513175e3cd8d07132dd4860809 # SHA for version 4.2.4
+      with:
+        key: collections-${{ runner.os }}-${{ steps.env_info.outputs.ansible_hash }}
+        path: ${{ steps.env_info.outputs.collections_dir }}
+
+    - name: Install dependencies according to requirements files
+      run: |
+        touch ${{ steps.env_info.outputs.ansible_reqs_file }}
+        make venv
+      shell: bash