SIENTIAPDE-1243: Initial commit of the model manager project, adding core files and configurations.

This commit introduces the initial project structure, including:
- .env.example: Example environment configuration.
- .github/workflows/quality-gate.yml: CI workflow for quality checks.
- .gitignore: Specifies intentionally untracked files that Git should ignore.
- Makefile: Automation of tasks like docker builds.
- README.md: Project documentation.
- Source code for model management, activities, utils, worker and workflows.
- Test suite.
- Dockerfile for the simulator.
- sonar-project.properties: SonarQube configuration file.
- values.yaml: Helm chart values for deployment.

.github/workflows/quality-gate.yml

@@ -0,0 +1,74 @@
+name: Quality gate
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+    types: [ opened, synchronize, reopened ]
+
+jobs:
+  sonar:
+    name: SonarQube Analysis
+    runs-on: ubuntu-latest
+    permissions: write-all
+    steps:
+      - name: ⬇️ Checkout Code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+
+      - name: Generate App Token
+        id: generate-app-token
+        uses: actions/create-github-app-token@v1
+        with:
+          app-id: ${{ secrets.APP_ID }}
+          private-key: ${{ secrets.APP_PRIVATE_KEY }}
+          owner: 'Aignosi'
+          repositories: 'sientia-dataops-library,sientia-mlops-library'
+
+      - name: Prepare requirements.txt
+        id: prepare-requirements
+        run: |
+          sed -e "s|git+ssh://git@github.com/|git+https://github.com/|g" \
+              -e "s|git@github.com:|git+https://github.com/|g" \
+              requirements.txt > requirements_prepared.txt
+          echo "PROCESSED_REQUIREMENTS_FILE=requirements_prepared.txt" >> $GITHUB_OUTPUT
+
+      - name: Configure Git to use App Token
+        env:
+          GH_APP_TOKEN: ${{ steps.generate-app-token.outputs.token }}
+        run: |
+          git config --global url."https://oauth2:${GH_APP_TOKEN}@github.com/".insteadOf "https://github.com/"
+
+      - name: 🔧 Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.11"
+
+      - name: 🗄️ Cache Python dependencies
+        uses: actions/cache@v3
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles(steps.prepare-requirements.outputs.PROCESSED_REQUIREMENTS_FILE) }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+
+      - name: 📦 Install Dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r ${{ steps.prepare-requirements.outputs.PROCESSED_REQUIREMENTS_FILE }}
+          pip install pytest pytest-cov pytest-asyncio
+
+      - name: 🧪 Run Tests with Pytest
+        run: |
+          pytest tests --junitxml=pytest.xml --cov=laborious --cov-report=xml --cov-report=term
+
+      - name: Run SonarQube Analysis
+        uses: SonarSource/sonarqube-scan-action@v5
+        env:
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+          SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}