docker-compose.yaml: Update API to use docker image

Instead of doing local build - use docker image from registry.

Signed-off-by: Denys Fedoryshchenko <[email protected]>

docker-compose.yaml

@@ -8,16 +8,7 @@ services:
 
   api:
     container_name: 'kernelci-api'
-    build:
-      context: 'docker/api'
-      args:
-        - REQUIREMENTS=${REQUIREMENTS:-requirements.txt}
-        - core_rev=${CORE_REV:-main}
-    volumes:
-      - './api:/home/kernelci/api'
-      - './tests:/home/kernelci/tests'
-      - './migrations:/home/kernelci/migrations'
-      - './templates:/home/kernelci/templates'
+    image: kernelci/staging-api:${KERNELCI_API_VERSION:-latest}
     ports:
       - '${API_HOST_PORT:-8001}:8000'
     env_file: