Enhance CI workflow and refactor integration tests

- Added setup step for Ollama installation in the GitHub Actions workflow.
- Updated environment variables for integration tests to utilize an external Ollama host.
- Refactored test method names in OllamaAPIIntegrationTest for clarity and consistency, changing 'testAskModel' to 'testGenerate'.
- Introduced new tests for image processing from URLs and files, while removing outdated tests for improved test suite relevance.

.github/workflows/run-tests.yml

@@ -20,6 +20,10 @@ jobs:
         with:
           ref: ${{ github.event.inputs.branch }}
 
+      - name: Set up Ollama
+        run: |
+          curl -fsSL https://ollama.com/install.sh | sh
+
       - name: Set up JDK 17
         uses: actions/setup-java@v3
         with:
@@ -32,4 +36,7 @@ jobs:
         run: mvn clean test -Punit-tests
 
       - name: Run integration tests
-        run: mvn clean verify -Pintegration-tests
+        run: mvn clean verify -Pintegration-tests
+        env:
+          USE_EXTERNAL_OLLAMA_HOST: "true"
+          OLLAMA_HOST: "http://localhost:11434"