Publish runner & test-runner artifacts for Scala 2.12 & 2.13

Author: Gedochao

.github/workflows/ci.yml

@@ -1256,7 +1256,7 @@ jobs:
       env:
         PGP_SECRET: ${{ secrets.PGP_SECRET }}
     - run: ./mill -i ci.setShouldPublish
-    - run: ./mill -i publishSonatype '{__[],_}.publishArtifacts'
+    - run: ./mill -i publishSonatype '{__[],_,test-runner[2.13.13],test-runner[2.12.19],runner[2.13.13],runner[2.12.19]}.publishArtifacts'
       if: env.SHOULD_PUBLISH == 'true'
       env:
         PGP_PASSWORD: ${{ secrets.PGP_PASSPHRASE }}