Creder/allowing for multibranch custom workspaces (#63)

* Updates to build with java21

* CI updates for Java 21

* Additional CI updates

* Additional CI fixes

* Additional CI fixes

* Extra fixes

* Extra fixes

* Additional testing changes

* Adding updates to allow us to set custom workspaces

* Additional updates

* Additional updates

* Git cruft fix

* Custom workspace improvements

* Fix: Remove remaining merge conflict markers

- Removed conflict markers from Pipeline.kt
- Removed conflict markers from DockerAgent.kt
- Build verified successful
- All tests passing

* Version increment

* Fixing workspace path

* Version rev

---------

Co-authored-by: Caleb Reder <[email protected]>

Author: reder9

version.txt

@@ -1 +1 @@
-0.21.9
+0.21.10