Add JDK21 and macos-latest to CI

.github/workflows/ci.yml

@@ -22,9 +22,9 @@ jobs:
     name: Build and Test
     strategy:
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-latest, macos-latest]
         scala: [2.12.18, 2.13.12, 3.3.1]
-        java: [temurin@8, temurin@11, temurin@17]
+        java: [temurin@8, temurin@11, temurin@17, temurin@21]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
@@ -56,6 +56,14 @@ jobs:
           java-version: 17
           cache: sbt
 
+      - name: Setup Java (temurin@21)
+        if: matrix.java == 'temurin@21'
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+          cache: sbt
+
       - name: Check that workflows are up to date
         run: sbt '++ ${{ matrix.scala }}' githubWorkflowCheck
 
@@ -120,6 +128,14 @@ jobs:
           java-version: 17
           cache: sbt
 
+      - name: Setup Java (temurin@21)
+        if: matrix.java == 'temurin@21'
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+          cache: sbt
+
       - name: Download target directories (2.12.18)
         uses: actions/download-artifact@v4
         with:

build.sbt

@@ -200,8 +200,11 @@ ThisBuild / githubWorkflowPublishTargetBranches :=
     RefPredicate.Equals(Ref.Branch("main"))
   )
 
+ThisBuild / githubWorkflowOSes := Seq("ubuntu-latest", "macos-latest")
+
 ThisBuild / githubWorkflowJavaVersions := List(
   JavaSpec.temurin("8"),
   JavaSpec.temurin("11"),
-  JavaSpec.temurin("17")
+  JavaSpec.temurin("17"),
+  JavaSpec.temurin("21")
 )