Compile with Scala 3

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        scala: [2.13]
+        scala: [2.13, 3]
         java: [temurin@17, temurin@11]
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60
@@ -143,6 +143,16 @@ jobs:
           tar xf targets.tar
           rm targets.tar
 
+      - name: Download target directories (3)
+        uses: actions/download-artifact@v4
+        with:
+          name: target-${{ matrix.os }}-${{ matrix.java }}-3
+
+      - name: Inflate target directories (3)
+        run: |
+          tar xf targets.tar
+          rm targets.tar
+
       - name: Publish JARs
         env:
           PGP_PASSPHRASE: ${{ secrets.PGP_PASSPHRASE }}

.mergify.yml

@@ -23,6 +23,8 @@ pull_request_rules:
     - author=scala-steward-dev
   - status-success=Build and Test (ubuntu-latest, 2.13, temurin@17)
   - status-success=Build and Test (ubuntu-latest, 2.13, temurin@11)
+  - status-success=Build and Test (ubuntu-latest, 3, temurin@17)
+  - status-success=Build and Test (ubuntu-latest, 3, temurin@11)
   actions:
     merge:
       method: merge

build.sbt

@@ -22,10 +22,11 @@ val moduleCrossPlatformMatrix: Map[String, List[Platform]] = Map(
 )
 
 val Scala213 = "2.13.12"
+val Scala3 = "3.3.1"
 
 /// sbt-typelevel configuration
 
-ThisBuild / crossScalaVersions := Seq(Scala213)
+ThisBuild / crossScalaVersions := Seq(Scala213, Scala3)
 ThisBuild / githubWorkflowTargetTags ++= Seq("v*")
 ThisBuild / githubWorkflowPublishTargetBranches := Seq(
   RefPredicate.Equals(Ref.Branch(mainBranch)),
@@ -115,6 +116,7 @@ lazy val core = myCrossProject("core")
   .enablePlugins(BuildInfoPlugin, JavaAppPackaging, DockerPlugin)
   .settings(dockerSettings)
   .settings(
+    crossScalaVersions := Seq(Scala213, Scala3),
     libraryDependencies ++= Seq(
       Dependencies.bcprovJdk15to18,
       Dependencies.betterFiles,