use the build-logic and main-build-artifacts caches for snapshots

GitHub Actions caches have scopes.  For any given pull request, it can download its own caches and it can download the caches associated with the `main` branch.  Once that PR branch is merged, its cache is useless.

By using and writing to these two caches on the `main` branch, we speed up the `publish` builds but we also keep the caches as up-to-date as possible.  In turn, that means more build cache hits and faster builds for all pull requests.

Author: RBusarow

.github/workflows/publish-snapshot.yml

@@ -23,11 +23,13 @@ jobs:
         uses : ./.github/actions/gradle-task
         with :
           task : checkVersionIsSnapshot
+          write-cache-key : build-logic
 
       - name : Assemble
         uses : ./.github/actions/gradle-task
         with :
           task : assemble
+          write-cache-key : main-build-artifacts
 
       - name : Check
         uses : ./.github/actions/gradle-task