Add Couchbase 2.5 and generic Docker images

Introduces a new Docker image for Couchbase 2.5, including a Dockerfile, entrypoint, run scripts, and a dummy script for unsupported commands. Updates the 2.5 image to install libssl0.9.8 and modifies the CMD to use '-noinput'. Adds a README with credits and updates the GitHub Actions workflow to download the new dependency.

README.md

@@ -0,0 +1,6 @@
+# Docker Images
+
+## Credits:
+
+### Couchbase
+- https://github.com/couchbase/docker/tree/couchbase-server-4.0.0-community