chore: Add Shopware 6.6.9

Author: aragon999

.github/workflows/build-docker-images.yaml

@@ -271,6 +271,10 @@ jobs:
             php-version: "8.3"
             flavour: alpine
             template: https://github.com/shopware/shopware
+          - shopware-version: v6.6.9.0
+            php-version: "8.3"
+            flavour: alpine
+            template: https://github.com/shopware/shopware
           - shopware-version: 6.4
             php-version: "8.1"
             flavour: alpine
@@ -439,6 +443,10 @@ jobs:
             php-version: "8.3"
             flavour: debian
             template: https://github.com/shopware/shopware
+          - shopware-version: v6.6.9.0
+            php-version: "8.3"
+            flavour: debian
+            template: https://github.com/shopware/shopware
           - shopware-version: 6.4
             php-version: "8.1"
             flavour: debian