chore: add Aspect Build to server providers (#302)

Aspect Build offers remote server resources providing both remote cache and remote execution capabilities.

Author: CaerusKaru

README.md

@@ -55,6 +55,7 @@ These tools use the Remote Execution API to distribute builds to workers.
 These applications implement the Remote Execution API to serve build requests
 from the clients above.
 
+* [Aspect Build](https://www.aspect.build/) (commercial)
 * [bazel-remote](https://github.com/buchgr/bazel-remote) (open source, cache only)
 * [Buildbarn](https://github.com/buildbarn) (open source)
 * [BuildBuddy](https://www.buildbuddy.io/) (commercial & open source)