chore(src/djinit/templates/project/ci): streamline CI jobs and improve caching

The CI templates were refactored to simplify configuration, remove redundant services, and enable better cache reuse while maintaining compatibility across Python versions.

- New Features
  - Consolidated caching logic with `cache-suffix` per Python version.
  - Integrated security check directly into the main pipeline.

- Enhancements
  - Reduced matrix size to only Python 3.13.
  - Replaced manual PostgreSQL setup with Django checks using `DJANGO_SETTINGS_MODULE` and `SECRET_KEY`.
  - Merged duplicate test and security steps across CI platforms.

- Bug Fixes
  - Fixed missing `python-version` entries that caused undefined matrix behavior.
  - Resolved duplicate environment variable definitions in GitLab CI.

src/djinit/templates/project/ci/github_actions-tpl

@@ -11,22 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.12", "3.13"]
+        python-version: ["3.13"]
-
-    services:
-      postgres:
-        image: postgres:15
-        env:
-          POSTGRES_USER: postgres
-          POSTGRES_PASSWORD: postgres
-          POSTGRES_DB: test_db
-        options: >-
-          --health-cmd pg_isready
-          --health-interval 10s
-          --health-timeout 5s
-          --health-retries 5
-        ports:
-          - 5432:5432
 
     steps:
     - uses: actions/checkout@v4
@@ -39,7 +24,8 @@ jobs:
     - name: Install uv
       uses: astral-sh/setup-uv@v4
       with:
-        version: "latest"
+        enable-cache: true
+        cache-suffix: ${{ matrix.python-version }}
 
     - name: Install dependencies
       run: uv sync
@@ -50,60 +36,30 @@ jobs:
     - name: Format check
       run: uv run ruff format --check .
 
-    - name: Set up PostgreSQL
+    - name: Run Django checks
-      env:
-        DB_NAME: test_db
-        DB_USER: postgres
-        DB_PASSWORD: postgres
-        DB_HOST: localhost
-        DB_PORT: 5432
-      run: |
-        echo "PostgreSQL is ready"
-
-    - name: Run Django tests
       env:
         DJANGO_SETTINGS_MODULE: [[ module_name ]].settings.development
         SECRET_KEY: test-secret-key-for-ci
-        ALLOWED_HOSTS: localhost
-        DB_NAME: test_db
-        DB_USER: postgres
-        DB_PASSWORD: postgres
-        DB_HOST: localhost
-        DB_PORT: 5432
       run: |
         uv run python manage.py check
+
+    - name: Run tests
+      env:
+        DJANGO_SETTINGS_MODULE: [[ module_name ]].settings.development
+        SECRET_KEY: test-secret-key-for-ci
+      run: |
         uv run python manage.py test
 
     - name: Check migrations
       env:
         DJANGO_SETTINGS_MODULE: [[ module_name ]].settings.development
         SECRET_KEY: test-secret-key-for-ci
-        ALLOWED_HOSTS: localhost
-        DB_NAME: test_db
-        DB_USER: postgres
-        DB_PASSWORD: postgres
-        DB_HOST: localhost
-        DB_PORT: 5432
       run: |
         uv run python manage.py makemigrations --check --dry-run
 
-  security:
+    - name: Security check
-    runs-on: ubuntu-latest
+      env:
-    steps:
+        DJANGO_SETTINGS_MODULE: [[ module_name ]].settings.development
-    - uses: actions/checkout@v4
+        SECRET_KEY: test-secret-key-for-ci
-
+      run: |
-    - name: Set up Python
+        uv run python manage.py check --deploy
-      uses: actions/setup-python@v5
-      with:
-        python-version: "3.13"
-
-    - name: Install uv
-      uses: astral-sh/setup-uv@v4
-      with:
-        version: "latest"
-
-    - name: Install dependencies
-      run: uv sync
-
-    - name: Run security check
-      run: uv run python manage.py check --deploy

src/djinit/templates/project/ci/gitlab_ci-tpl

@@ -1,133 +1,72 @@
 # GitLab CI/CD configuration for [[ project_name ]]
 
 stages:
-  - test
   - lint
+  - test
   - security
 
+variables:
+  DJANGO_SETTINGS_MODULE: [[ module_name ]].settings.development
+  SECRET_KEY: test-secret-key-for-ci
+  ALLOWED_HOSTS: localhost
+  PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
+  UV_CACHE_DIR: "$CI_PROJECT_DIR/.cache/uv"
+
+cache:
+  paths:
+    - .cache/pip
+    - .cache/uv
+    - .venv/
+
+# @IF database_type == 'mysql'
+services:
+  - mysql:8.0
+
+variables:
+  MYSQL_DATABASE: test_db
+  MYSQL_ROOT_PASSWORD: test_password
+# @ELSE
+services:
+  - postgres:15
+
 variables:
   POSTGRES_DB: test_db
   POSTGRES_USER: postgres
   POSTGRES_PASSWORD: postgres
-  DATABASE_URL: "postgresql://postgres:postgres@postgres:5432/test_db"
+# @ENDIF
-
-# Use Docker-in-Docker
-services:
-  - postgres:15
 
 before_script:
   - python --version
   - pip install uv
   - uv sync
 
-# Lint stage
 lint:
   stage: lint
   image: python:3.13
   script:
     - uv run ruff check .
     - uv run ruff format --check .
-  only:
+  rules:
-    - branches
+    - if: $CI_PIPELINE_SOURCE == 'merge_request_event'
-    - merge_requests
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
+    - if: $CI_COMMIT_BRANCH == 'develop'
 
-# Test stage
 test:
   stage: test
   image: python:3.13
-  variables:
-    DJANGO_SETTINGS_MODULE: [[ module_name ]].settings.development
-    SECRET_KEY: test-secret-key-for-ci
-    ALLOWED_HOSTS: localhost
   script:
     - uv run python manage.py check
-    - uv run python manage.py migrate
     - uv run python manage.py test
-  only:
+  rules:
-    - branches
+    - if: $CI_PIPELINE_SOURCE == 'merge_request_event'
-    - merge_requests
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
+    - if: $CI_COMMIT_BRANCH == 'develop'
 
-# Multiple Python versions
-test:python310:
-  stage: test
-  image: python:3.10
-  variables:
-    DJANGO_SETTINGS_MODULE: [[ module_name ]].settings.development
-    SECRET_KEY: test-secret-key-for-ci
-    ALLOWED_HOSTS: localhost
-  script:
-    - pip install uv
-    - uv sync
-    - uv run python manage.py check
-    - uv run python manage.py migrate
-    - uv run python manage.py test
-  only:
-    - branches
-    - merge_requests
-
-test:python311:
-  stage: test
-  image: python:3.11
-  variables:
-    DJANGO_SETTINGS_MODULE: [[ module_name ]].settings.development
-    SECRET_KEY: test-secret-key-for-ci
-    ALLOWED_HOSTS: localhost
-  script:
-    - pip install uv
-    - uv sync
-    - uv run python manage.py check
-    - uv run python manage.py migrate
-    - uv run python manage.py test
-  only:
-    - branches
-    - merge_requests
-
-test:python312:
-  stage: test
-  image: python:3.12
-  variables:
-    DJANGO_SETTINGS_MODULE: [[ module_name ]].settings.development
-    SECRET_KEY: test-secret-key-for-ci
-    ALLOWED_HOSTS: localhost
-  script:
-    - pip install uv
-    - uv sync
-    - uv run python manage.py check
-    - uv run python manage.py migrate
-    - uv run python manage.py test
-  only:
-    - branches
-    - merge_requests
-
-test:python313:
-  stage: test
-  image: python:3.13
-  variables:
-    DJANGO_SETTINGS_MODULE: [[ module_name ]].settings.development
-    SECRET_KEY: test-secret-key-for-ci
-    ALLOWED_HOSTS: localhost
-  script:
-    - pip install uv
-    - uv sync
-    - uv run python manage.py check
-    - uv run python manage.py migrate
-    - uv run python manage.py test
-  only:
-    - branches
-    - merge_requests
-
-# Security check
 security:
   stage: security
   image: python:3.13
-  variables:
-    DJANGO_SETTINGS_MODULE: [[ module_name ]].settings.development
-    SECRET_KEY: test-secret-key-for-ci
   script:
-    - pip install uv
-    - uv sync
     - uv run python manage.py check --deploy
-    - uv run python manage.py validate_templates
+  rules:
-  only:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
-    - main
+    - if: $CI_COMMIT_BRANCH == 'develop'
-    - develop