Split Makfile and move workflow to Makefile (#88)

Co-authored-by: codacy-production[bot] <61871480+codacy-production[bot]@users.noreply.github.com>

.github/workflows/variables.yml

@@ -1,27 +0,0 @@
-name: Repo Tests
-
-on:
-  push:
-    branches:
-      - 'main'
-    tags:
-      - 'v*'
-  pull_request:
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  variables:
-    name: Check variables are listed
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-    steps:
-      - name: Checkout repo
-        uses: actions/checkout@v4
-        
-      - name: Run test
-        run: |
-          /bin/bash tests/repo/vars.sh