Add dependency caching to CI/CD pipeline

Added actions/cache@v3 to cache Poetry and pip dependencies across
workflow runs. This significantly speeds up CI/CD by avoiding
full reinstallation when poetry.lock hasn't changed.

Cache strategy:
- Cache key based on OS and poetry.lock hash
- Caches ~/.cache/pypoetry and ~/.cache/pip
- Falls back to OS-specific cache if exact match not found

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitea/workflows/mlops-pipeline.yml

@@ -17,10 +17,21 @@ jobs:
         with:
           python-version: '3.12'
 
+      - name: Cache Poetry dependencies
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cache/pypoetry
+            ~/.cache/pip
+          key: ${{ runner.os }}-poetry-${{ hashFiles('**/poetry.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-poetry-
+
+      - name: Install Poetry
+        run: pip install poetry
+
       - name: Install dependencies
-        run: |
+        run: poetry install --no-interaction
-          pip install poetry
-          poetry install
 
       - name: Setup DVC
         run: |
@@ -47,10 +58,21 @@ jobs:
         with:
           python-version: '3.12'
 
+      - name: Cache Poetry dependencies
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cache/pypoetry
+            ~/.cache/pip
+          key: ${{ runner.os }}-poetry-${{ hashFiles('**/poetry.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-poetry-
+
+      - name: Install Poetry
+        run: pip install poetry
+
       - name: Install dependencies
-        run: |
+        run: poetry install --no-interaction
-          pip install poetry
-          poetry install
 
       - name: Setup DVC
         run: |