Add push trigger for release/8.2 and update Redis version to 8.2-rc1-int

- Add push trigger for release/8.2 branch in GitHub Actions workflow
- Update Redis version from 8.2-m01 to 8.2-rc1-int in both Alpine and Debian Dockerfiles
- Update SHA256 hash for the new Redis version tag

Author: adamiBs

.github/workflows/pre-merge.yml

@@ -4,6 +4,9 @@ on:
     branches:
       - master
       - release/*
+  push:
+    branches:
+      - release/8.2
 
 jobs:
   build-and-test: