[2.x] test: Community Build (#9659)

This adds community build based on the JUnit harness used on scala/scala3.

.github/workflows/ci.yml

@@ -56,10 +56,10 @@ jobs:
             java: 17
             distribution: zulu
             jobtype: 12
-          # - os: ubuntu-latest
-          #   java: 17
-          #   distribution: temurin
-          #   jobtype: 13
+          - os: ubuntu-latest
+            java: 17
+            distribution: temurin
+            jobtype: 13
     runs-on: ${{ matrix.os }}
     timeout-minutes: 25
     env:
@@ -196,8 +196,8 @@ jobs:
         shell: bash
         run: |
           ./sbt -v --server "scripted cache/*"
-      # - name: Hash Benchmark
-      #   if: ${{ matrix.jobtype == 13 }}
-      #   shell: bash
-      #   run: |
-      #     ./sbt -v "hashBenchmark/Jmh/run -i 5 -wi 3 -f1 -t1"
+      - name: Community build
+        if: ${{ matrix.jobtype == 13 }}
+        shell: bash
+        run: |
+          ./sbt -v --server "community-build/test"