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- Deleted the outdated Woodpecker build-arm.yml file as it is no longer needed.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.

e2e/docker-compose.test.yml

@@ -54,6 +54,27 @@ services:
     networks:
       - e2e-net
 
+  e2e-runner:
+    build: .
+    depends_on:
+      swtpm:
+        condition: service_started
+      mock-api:
+        condition: service_started
+      mock-cdn:
+        condition: service_started
+      system-under-test:
+        condition: service_started
+    environment:
+      LOADER_URL: http://system-under-test:8080
+      MINIO_URL: http://mock-cdn:9000
+      COMPOSE_PROJECT_NAME: ${COMPOSE_PROJECT_NAME:-loader-e2e}
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+      - ./results:/results
+    networks:
+      - e2e-net
+
 networks:
   e2e-net:
     driver: bridge