Add 3.1.0 to build but disable publish

Author: ashawley

.circleci/config.yml

@@ -99,6 +99,10 @@ workflows:
       - scala_job:
           name: 3.0.2
           java_version: jdk8
+          scala_version: 3.0.2
+      - scala_job:
+          name: 3.1.0
+          java_version: jdk8
           scala_version: 3.1.0
       - scala_job:
           name: jdk11_2.12
@@ -111,6 +115,10 @@ workflows:
       - scala_job:
           name: jdk11_3.0
           java_version: jdk11
+          scala_version: 3.0.2
+      - scala_job:
+          name: jdk11_3.1
+          java_version: jdk11
           scala_version: 3.1.0
       - scala_job:
           name: jdk17_2.12
@@ -123,6 +131,10 @@ workflows:
       - scala_job:
           name: jdk17_3.0
           java_version: jdk17
+          scala_version: 3.0.2
+      - scala_job:
+          name: jdk17_3.1
+          java_version: jdk17
           scala_version: 3.1.0
       - scalajs_job:
           name: sjs1.0_2.12
@@ -132,6 +144,9 @@ workflows:
           scala_version: 2.13.6
       - scalajs_job:
           name: sjs1.0_3
+          scala_version: 3.0.2
+      - scalajs_job:
+          name: sjs1.0_3.1
           scala_version: 3.1.0
       - scalanative_job:
           name: native0.4_2.12

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         java: [8, 11, 17]
-        scala: [2.12.15, 2.13.6, 3.1.0]
+        scala: [2.12.15, 2.13.6, 3.0.2, 3.1.0]
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2

build.sbt

@@ -38,6 +38,12 @@ lazy val xml = crossProject(JSPlatform, JVMPlatform, NativePlatform)
     crossScalaVersions := Seq("2.13.6", "2.12.15", "3.0.2", "3.1.0"),
     scalaVersion := "2.12.15",
 
+    // Don't publish for Scala 3.1 or later, only from 3.0
+    publish / skip := (CrossVersion.partialVersion(scalaVersion.value) match {
+      case Some((3, x)) if x > 0 => true
+      case _                     => false
+    }),
+
     scalacOptions ++= (CrossVersion.partialVersion(scalaVersion.value) match {
       case Some((3, _)) =>
         Seq("-language:Scala2")