Use redis-stack:edge image istead of separate container

.github/workflows/stack.yml

@@ -21,11 +21,6 @@ jobs:
         ports:
           - 6379:6379
 
-      redis-gears:
-        image: redislabs/redisgears:edge
-        ports:
-          - 6380:6379
-
     strategy:
       fail-fast: false
       matrix:
@@ -38,6 +33,7 @@ jobs:
           - '8.2'
         redis:
           - latest
+          - edge
 
     steps:
       - name: Checkout
@@ -69,6 +65,7 @@ jobs:
         run: vendor/bin/phpunit --group realm-stack
 
       - name: Run redis gears tests
+        if: ${{ matrix.redis == 'edge' }}
         run: vendor/bin/phpunit --group gears
 
       - name: Run tests using Relay