Add a CI and package publishing Github actions.

Author: carlosame

.github/workflows/build.yml

@@ -0,0 +1,47 @@
+# Build workflow
+
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+  # Allows to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+
+  # Validate wrapper to prevent potential supply chain attack
+  gradle-wrapper-validation:
+    runs-on: ubuntu-latest
+
+    name: Validate Gradle wrapper
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: gradle/wrapper-validation-action@v1
+
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        java: [ '11', '17' ]
+
+    name: Java ${{ matrix.Java }} build
+
+    steps:
+      - uses: actions/checkout@v2
+
+      # Set JDK
+      - name: Set up JDK
+        uses: actions/setup-java@v2
+        with:
+          java-version: ${{ matrix.java }}
+          distribution: 'adopt'
+
+      # Build
+      - name: Build with Gradle
+        run: ./gradlew build

.github/workflows/publish-package.yml

@@ -0,0 +1,32 @@
+# This workflow will build a package using Gradle and then deploy it to GitHub
+# packages when a release is published
+
+name: Github Packages
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK 17
+      uses: actions/setup-java@v2
+      with:
+        java-version: '17'
+        distribution: 'adopt'
+        server-id: github
+        settings-path: ${{ github.workspace }}
+
+    - name: Build with Gradle
+      run: ./gradlew build -x test
+
+    - name: Publish to GitHub Packages
+      run: ./gradlew publish -PmavenReleaseRepoUrl="https://maven.pkg.github.com/css4j/web-apis" -PmavenRepoUsername=${{ github.actor }} -PmavenRepoPassword=${{ secrets.GITHUB_TOKEN }}