feat(backend): basic login and scylladb setup

.gitlab/merge_request_templates/default.md

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+## Description
+
+[Provide a brief description of the changes introduced by this merge request.]
+
+## Related Issues
+
+[Cite any related issues or feature requests that are addressed or resolved by this merge request. Use the gitlab syntax for linking issues, for example, `fixes #123` or `closes #123`.]
+
+## Type of Change
+
+- Change 1
+- Change 2
+
+## Potential side effects
+
+[Describe any potential side effects or risks of merging this MR.]
+
+## Screenshots / GIFs (if applicable)
+
+[Include any relevant screenshots or GIFs to showcase the changes made.]
+
+## Additional Comments
+
+[Add any additional comments or information that may be helpful for reviewers.]
+
+## Definition of Done
+- [ ] Documentation is up-to-date.
+