adds GitHub Actions integration

.github/workflows/ci-build.yaml

@@ -0,0 +1,36 @@
+name: Build
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: Build
+    strategy:
+      fail-fast: false
+      max-parallel: 2
+      matrix:
+        java:
+          - 8
+          - 11
+        os:
+          - ubuntu-latest
+          - windows-latest
+          - macos-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v1
+        with:
+          fetch-depth: 1
+      - uses: actions/setup-java@v1
+        with:
+          java-version: ${{ matrix.java }}
+      - name: Build
+        run: mvn -B -V -Prun-its clean verify jacoco:report
+      - name: Publish coverage reports
+        needs: Build
+        run: mvn coveralls:report

README.adoc

@@ -32,6 +32,7 @@ endif::[]
 ifdef::badges[]
 image:https://ci.appveyor.com/api/projects/status/chebmu91f08dlmsc/branch/master?svg=true["Build Status (AppVeyor)", link="https://ci.appveyor.com/project/asciidoctor/asciidoctor-maven-plugin"]
 image:http://img.shields.io/travis/asciidoctor/asciidoctor-maven-plugin/master.svg["Build Status (Travis CI)", link="https://travis-ci.org/asciidoctor/asciidoctor-maven-plugin"]
+image:{uri-repo}/workflows/ci-build/badge.svg[Build Status,link={uri-repo}/actions]
 image:http://img.shields.io/coveralls/{project-repo}/master.svg["Coverage Status", link="https://coveralls.io/r/{project-repo}?branch=master"]
 image:https://maven-badges.herokuapp.com/maven-central/org.asciidoctor/asciidoctor-maven-plugin/badge.svg["Maven Central",link="https://maven-badges.herokuapp.com/maven-central/org.asciidoctor/asciidoctor-maven-plugin"]
 endif::[]