Add template for Flipt

### Application Name

Flipt

### Describe the application

Enterprise-ready, Git native feature management solution

### URL to the application

https://www. flipt.io

### Source code

https://github.com/flipt-io/flipt

### Application Icon

https://avatars.githubusercontent.com/u/104992037

### Link to Docker compose

_No response_

### Maintainer

- [ ] I am the maintainer

Start by locating the existing application templates in the Kubero repository and compare their required metadata with the Flipt details in this issue. Add a Flipt template using the provided application name, description, URLs, icon, and maintainer information; done means it follows the existing template format and is recognized by the project.

Written by the indexing model from the issue text.