Update .gitignore, remove obsolete Woodpecker build file, and add e2e-runner service to docker-compose

- Added 'e2e/results/' to .gitignore to exclude end-to-end test results.
- Deleted the outdated Woodpecker build-arm.yml file as it is no longer needed.
- Introduced a new e2e-runner service in docker-compose.test.yml to facilitate end-to-end testing with dependencies on other services.

.woodpecker/01-test.yml

@@ -0,0 +1,31 @@
+when:
+  event: [push, pull_request, manual]
+  branch: [dev, stage, main]
+
+labels:
+  platform: arm64
+
+steps:
+  - name: e2e
+    image: docker:24
+    environment:
+      COMPOSE_PROJECT_NAME: loader-e2e
+    commands:
+      - cd e2e
+      - mkdir -p results
+      - docker compose -f docker-compose.test.yml up --build --abort-on-container-exit --exit-code-from e2e-runner
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+
+  - name: e2e-report
+    image: docker:24
+    when:
+      status: [success, failure]
+    environment:
+      COMPOSE_PROJECT_NAME: loader-e2e
+    commands:
+      - cd e2e
+      - docker compose -f docker-compose.test.yml down -v || true
+      - test -f results/report.csv && cat results/report.csv || echo "no report"
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock