Refactor CI/CD pipeline to install dependencies before setting up DVC

.github/workflows/mlops-pipeline.yml

@@ -37,10 +37,18 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       
-      - name: Setup DVC
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.12'
+      
+      - name: Install dependencies
         run: |
-          pip install dvc[s3]
+          pip install poetry
-          dvc pull
+          poetry install
+      
+      - name: Setup DVC
+        run: poetry run dvc pull
       
       - name: Train model
         run: poetry run python src/models/train.py