chg: try splash docker in gh actions

.github/workflows/instance_test.yml

@@ -7,6 +7,15 @@ on:
     branches: [ main ]
 
 jobs:
+
+  splash-container:
+     image: scrapinghub:splash
+     options: --disable-browser-caches
+     ports:
+       - 8050:8050
+       - 5023:5023
+
+  lookyloo-container:
     build:
 
       runs-on: ubuntu-latest
@@ -21,12 +30,6 @@ jobs:
         with:
           python-version: ${{matrix.python-version}}
 
-    - name: Install & run splash
-      run: |
-        sudo apt install docker.io
-        sudo docker pull spcrapinghub/splash
-        sudo docker run -p 8050:8050 -p 5023:5023 scrapinghub/splash --disable-browser-caches
-        
       - name: Install and setup redis
         run: |
           git clone https://github.com/antirez/redis.git