chore: add develocity token to the new nightly artifacts workflow (scala#23780)

We add the develocity token to the nightly artifact release workflow to
be able to consume the artifacts from caching and have build scans
published for nightly releases.

/cc @Duhemm

Author: hamzaremmal

.github/workflows/release-maven-artifacts.yml

@@ -7,6 +7,9 @@ on:
         required: true
         type: string
 
+env:
+  DEVELOCITY_ACCESS_KEY: ${{ secrets.DEVELOCITY_ACCESS_KEY }}
+
 jobs:
   release-maven-artifacts:
     runs-on: ubuntu-latest