ci(github-actions): migrate from tox to pre-commit

Simplified CI workflow by replacing multiple tox-based jobs with a single
pre-commit job that runs all quality checks (Terraform linting, Python
formatting, unit tests) through unified tooling. This reduces complexity
and maintains consistency with local development workflow.

Author: diodonfrost

.github/workflows/CI.yml

@@ -6,77 +6,27 @@ on:
     - cron: '0 18 * * SUN'
 
 jobs:
-  lint:
-    name: Terraform validate ${{ matrix.terraform_version }}
+  pre-commit:
+    name: Pre-commit checks
     runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        terraform_version:
-          - latest
-          - 1.2.9
-          - 1.1.9
-    steps:
-      - uses: actions/checkout@master
-      - uses: hashicorp/setup-terraform@v2
-        with:
-          terraform_version: "${{ matrix.terraform_version }}"
-
-      - name: Terraform version
-        id: version
-        run: terraform version
-      - name: Terraform fmt
-        id: fmt
-        run: terraform fmt -check
-        continue-on-error: true
-      - name: Terraform init
-        id: init
-        run: terraform init 
-      - name: Terraform Validate
-        id: validate
-        run: terraform validate -no-color
-
-  pythontest:
-    name: ${{ matrix.config.toxenv }}
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        config:
-          - toxenv: py37
-            python-version: 3.7
-          - toxenv: py38
-            python-version: 3.8
-          - toxenv: py39
-            python-version: 3.9
-          - toxenv: py310
-            python-version: '3.10'
-          # - toxenv: py311
-          #   python-version: 3.11
-          - toxenv: flake8
-            python-version: 3.8
-          - toxenv: pylint
-            python-version: 3.8
-          - toxenv: black
-            python-version: 3.8
-          - toxenv: mypy
-            python-version: 3.8
-          - toxenv: pytest
-            python-version: 3.8
-
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.13'
 
-      - name: Set up Python version
-        uses: actions/setup-python@v2
+      - name: Install Terraform
+        uses: hashicorp/setup-terraform@v3
         with:
-          python-version: ${{ matrix.config.python-version }}
+          terraform_version: 'latest'
 
       - name: Install dependencies
-        run: python -m pip install tox==3.20.0
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements-dev.txt
 
-      - name: Python test
-        run: tox
-        env:
-          TOXENV: "${{ matrix.config.toxenv }}"
+      - name: Run pre-commit
+        uses: pre-commit/action@v3.0.1