Fixing Deployment to Maven-Central in GitHub Actions

[PhilippSchmelter]

Solves #1029
This pull request includes several changes to the CI/CD pipeline, updates to the changelog, and improvements to Gradle scripts. The most important changes focus on enhancing the deployment process and improving the error messages for branch name validation.

CI/CD Pipeline Enhancements:

• Added environment variables for Maven Central deployment and updated the deployment process to dynamically determine the version based on the branch (main or dev). (.github/workflows/ci.yml)

Changelog Updates:

• Documented the implementation of the GitHub Actions Pipeline. (CHANGELOG.md)
• Noted the fix for deployment of simona to Maven Central in the new GitHub Actions Pipeline. (CHANGELOG.md)

Gradle Script Improvements:

• Enhanced the error message for invalid branch names to include the current branch name. (gradle/scripts/branchName.gradle)
• Moved the signing configuration to use in-memory PGP keys and updated the publication signing process. (gradle/scripts/mavenCentralPublish.gradle)
• Registered currentVersion and devVersion tasks using the tasks.register method for better task management. (gradle/scripts/semVer.gradle)

[sebastian-peter]

Thanks a lot for fixing this!

[PhilippSchmelter]

Thanks a lot for fixing this!

Thanks a lot for helping! I think this one is on both of us :D