chore: Add scalaNextVersion and add it into GitHub CI Actions

Author: lqhuang

.github/workflows/actions.yml

@@ -9,6 +9,12 @@ on:
   pull_request:
     branches:
       - master
+  workflow_dispatch: # be able to manually trigger a workflow run
+
+env:
+  SCALA_NEXT_VERSION: '3.6.2'
+  # TODO: perherps, it would be nice to allow failure on `SCALA_NEXT_VERSION` as a warning
+  #       to avoid too strict dev experiences in the future improvements.
 
 jobs:
   test:
@@ -23,7 +29,7 @@ jobs:
           distribution: 'temurin'
           java-version: ${{ matrix.java }}
       - name: Run tests
-        run: ./mill -i __.publishArtifacts + __.test
+        run: ./mill -DscalaNextVersion=${{ env.SCALA_NEXT_VERSION }} -i __.publishArtifacts + __.test
 
   check-binary-compatibility:
     runs-on: ubuntu-latest
@@ -36,7 +42,7 @@ jobs:
           distribution: 'temurin'
           java-version: 17
       - name: Check Binary Compatibility
-        run: ./mill -i __.mimaReportBinaryIssues
+        run: ./mill -DscalaNextVersion=${{ env.SCALA_NEXT_VERSION }} -i __.mimaReportBinaryIssues
 
   publish-sonatype:
     if: github.repository == 'com-lihaoyi/requests-scala' && contains(github.ref, 'refs/tags/')

build.mill

@@ -10,8 +10,8 @@ import $ivy.`com.github.lolgab::mill-mima::0.0.24`
 import de.tobiasroeser.mill.vcs.version.VcsVersion
 import com.github.lolgab.mill.mima._
 
-val dottyVersion = sys.props.get("dottyVersion")
-val scalaVersions = List("2.12.20", "2.13.15", "3.3.4") ++ dottyVersion
+val scalaNextVersion = sys.props.get("scalaNextVersion")
+val scalaVersions = List("2.12.20", "2.13.15", "3.3.4") ++ scalaNextVersion
 
 trait RequestsJvmModule extends RequestsModule with Mima {
   def mimaPreviousArtifacts = Agg(