Add E2E tests, fix bugs

Made-with: Cursor

_docs/02_document/deployment/ci_cd_pipeline.md

@@ -0,0 +1,29 @@
+# CI/CD Pipeline
+
+## Woodpecker CI
+
+**Config**: `.woodpecker/build-arm.yml`
+
+**Trigger**: push or manual event on `dev`, `stage`, `main` branches
+
+**Platform label**: `arm64`
+
+## Pipeline Steps
+
+### Step: build-push
+
+**Image**: `docker` (Docker-in-Docker)
+
+**Actions**:
+1. Determine tag: `arm` for `main` branch, `{branch}-arm` for others
+2. Build Docker image: `docker build -f Dockerfile -t localhost:5000/loader:$TAG .`
+3. Push to local registry: `docker push localhost:5000/loader:$TAG`
+
+**Volumes**: Docker socket (`/var/run/docker.sock`)
+
+## Notes
+
+- Only ARM64 builds are configured — no x86/amd64 build target
+- Registry is `localhost:5000` — a local Docker registry assumed to be running on the CI runner
+- No test step in the pipeline (no tests exist in the codebase)
+- No multi-stage build (single Dockerfile, no image size optimization)