ci(pylint): install project dependencies and enable pip cache

Author: valorisa

.github/workflows/pylint.yml

@@ -1,23 +1,37 @@
 name: Pylint
 
-on: [push]
+on:
+  push:
+  pull_request:
 
 jobs:
   build:
     runs-on: ubuntu-latest
+
     strategy:
       matrix:
         python-version: ["3.10", "3.11", "3.12", "3.13"]
+
     steps:
-    - uses: actions/checkout@v7
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v7
-      with:
-        python-version: ${{ matrix.python-version }}
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install pylint
-    - name: Analysing the code with pylint
-      run: |
-        pylint $(git ls-files '*.py')
+      - uses: actions/checkout@v7
+
+      - uses: actions/setup-python@v7
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: pip
+          cache-dependency-path: requirements.txt
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install pylint
+          pip install -r requirements.txt
+
+      - name: Run pylint
+        run: |
+          FILES=$(git ls-files '*.py')
+          if [ -n "$FILES" ]; then
+              pylint $FILES
+          else
+              echo "No Python files found."
+          fi