Merge pull request #46 from mkurz/ubuntu_24.04

CI: Upgrade ubuntu + install sbt

Author: mkurz

.github/workflows/publish.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   publish-artifacts:
     name: JDK 8
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     if: ${{ github.repository_owner == 'sbt' }}
     steps:
       - name: Checkout
@@ -27,6 +27,9 @@ jobs:
         with:
           jvm: adoptium:8
 
+      - name: Install sbt
+        uses: sbt/setup-sbt@v1
+
       - name: Publish artifacts
         run: sbt ci-release
         env: