Implement release branch with bug-fixes
For an improved user experience we will implement the integration of bug fixes for the last released version (currently [6.3.3](https://gitlab.opengeosys.org/ogs/ogs/-/releases/6.3.3)):
- After release we create a new branch `v6.x.x`
- The branch will get bug-fixes from the main development line (from the master-branch)
- We will provide updated release binaries with every fix (downloadable via website)
- The branch will receive fixes until the next release
##### TODOs:
- [x] Create branch [`v6.3.3`](https://gitlab.opengeosys.org/ogs/ogs/-/tree/v6.3.3)
- [x] Cherry pick already merged fixes since 6.3.3 tag
- ~~!3382~~
- ~~https://gitlab.opengeosys.org/ogs/ogs/-/merge_requests/3361~~
- ~~!3381~~
- ~~!3395~~
- ~~!3396~~
- [x] Implement release binary generation and deployment to website
- [x] Make announcement on discourse -> [post](https://discourse.opengeosys.org/t/release-branch-and-binaries-with-bugfixes-available/696)
issue