Release v2.1.0

What's Changed

• Add Apache-2.0 license and clarify immutable Yocto contract pinning by @Copilot in #2
• bump version by enhancing new variables by @chaithubk in #3
• ci: better release pattern and docs by @chaithubk in #4
• ci: fix release workflow by @chaithubk in #5

New Contributors

• @chaithubk made their first contribution in #3

Full Changelog: v2.0.0...v2.1.0