LCORE-1873: Add container lifecycle integration tests

Add automated test suite for Llama Stack container build, startup, health
monitoring, configuration, and teardown operations. Tests verify Makefile
container orchestration targets work correctly across podman and docker.

Key features:
- Class-scoped managed container fixture
- Image ID-based idempotency verification (deterministic, container runtime cache-agnostic)
- Host-side HTTP health checks
- Parametrized mount point verification
- Destructive test ordering to prevent dev environment impact
- Proper cleanup of stale artifacts to prevent false positives

Test coverage:
- Build: Image creation and idempotency via SHA256 comparison
- Deployment: Container startup, health checks, port mapping, volume mounts
- Configuration: Custom port handling
- Teardown: Graceful stop, log persistence, full cleanup
- Error handling: Double-start replacement behavior

Signed-off-by: Anik Bhattacharjee <anbhatta@redhat.com>

Author: anik120

.github/workflows/integration_tests.yaml

@@ -28,4 +28,6 @@ jobs:
       - name: Install pdm  # Required for dynamic version test
         run: uv pip install pdm
       - name: Run integration tests
+        env:
+          OPENAI_API_KEY: "sk-dummy-key-for-testing"
         run: uv run pytest tests/integration --cov=src --cov=runner --cov-report term-missing

pyproject.toml

@@ -125,6 +125,7 @@ dev = [
     "pytest-cov>=5.0.0",
     "pytest-mock>=3.14.0",
     "pytest-asyncio>=1.0.0",
+    "pytest-order>=1.2.0",
     "pyright>=1.1.401",
     "pylint>=3.3.7",
     "pydocstyle>=6.3.0",
@@ -220,6 +221,10 @@ pythonpath = [
 addopts = [
     "--import-mode=importlib",
 ]
+markers = [
+    "destructive: marks tests as destructive (deselect with '-m \"not destructive\"')",
+    "order: controls test execution order (requires pytest-order plugin)",
+]
 
 [tool.pylint.main]
 source-roots = "src"