replace Travis-CI with GitHub Actions

and upgrade to sbt-scala-module 3.0.0

context is scala/scala-dev#785

Author: SethTisue

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: test
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        java: [8, 11, 17]
+        scala: [2.13.6]
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+    - uses: coursier/cache-action@v6
+    - uses: actions/setup-java@v2
+      with:
+        distribution: adopt
+        java-version: ${{matrix.java}}
+    - name: Test
+      run: sbt ++${{matrix.scala}} test package

.github/workflows/release.yml

@@ -0,0 +1,21 @@
+name: Release
+on:
+  push:
+    tags: ["*"]
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-java@v2
+        with:
+          distribution: adopt
+          java-version: 8
+      - run: sbt versionCheck ci-release
+        env:
+          PGP_PASSPHRASE: ${{secrets.PGP_PASSPHRASE}}
+          PGP_SECRET: ${{secrets.PGP_SECRET}}
+          SONATYPE_PASSWORD: ${{secrets.SONATYPE_PASSWORD}}
+          SONATYPE_USERNAME: ${{secrets.SONATYPE_USERNAME}}

.travis.yml

@@ -1,6 +1,5 @@
 # scala-collection-contrib
 
-[<img src="https://travis-ci.org/scala/scala-collection-contrib.svg?branch=master"/>](https://travis-ci.org/scala/scala-collection-contrib)
 [<img src="https://img.shields.io/maven-central/v/org.scala-lang.modules/scala-collection-contrib_2.13.svg?label=scala+2.13"/>](http://search.maven.org/#search%7Cga%7C1%7Cg%3Aorg.scala-lang.modules%20a%3Ascala-collection-contrib_2.13)
 
 This module provides various additions to the Scala 2.13 standard collections.

README.md

@@ -1,3 +1,5 @@
+ThisBuild / scalaVersion := "2.13.6"
+
 lazy val root = project.in(file("."))
   .aggregate(collectionContrib.jvm, collectionContrib.js)
   .settings(

build.sbt

@@ -1,7 +1,3 @@
-val scalaJSVersion =
-  Option(System.getenv("SCALAJS_VERSION")).filter(_.nonEmpty).getOrElse("1.7.0")
-
-addSbtPlugin("org.scala-lang.modules" % "sbt-scala-module" % "2.4.0")
-
+addSbtPlugin("org.scala-lang.modules" % "sbt-scala-module" % "3.0.0")
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.1.0")
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % scalaJSVersion)
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.7.0")