Add GitHub Actions.

Author: nedtwigg

.github/workflows/changelog-print.yml

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+name: changelogPrint
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: changelogPrint
+    steps:
+      - uses: actions/checkout@v3
+      - name: jdk 11
+        uses: actions/setup-java@v3
+        with:
+          java-version: 11
+          distribution: 'temurin'
+      - name: gradle caching
+        uses: gradle/gradle-build-action@v2
+        with:
+          gradle-home-cache-cleanup: true
+      - run: ./gradlew changelogPrint

.github/workflows/ci.yml

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+on:
+  pull_request:
+  push:
+    branches: [main]
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        jre: [11, 17]
+        os: [ubuntu-latest]
+        include:
+          - jre: 17
+            os: windows-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install JDK ${{ matrix.jre }}
+        uses: actions/setup-java@v3
+        with:
+          distribution: "temurin"
+          java-version: ${{ matrix.jre }}
+      - name: gradle caching
+        uses: gradle/gradle-build-action@v2
+        with:
+          gradle-home-cache-cleanup: true
+      - name: git fetch origin main
+        run: git fetch origin main
+      - name: gradlew build
+        run: ./gradlew build
+      - name: junit result
+        uses: mikepenz/action-junit-report@v3
+        if: always() # always run even if the previous step fails
+        with:
+          check_name: JUnit ${{ matrix.jre }} ${{ matrix.os }}
+          report_paths: '*/build/test-results/*/TEST-*.xml'

.github/workflows/deploy.yml

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+# GH_TOKEN
+# NEXUS_USER
+# NEXUS_PASS64 (base64 NOTE: `base64` and `openssl base64` failed, had to use Java
+#   byte[] data = "{{password}}".getBytes(StandardCharsets.UTF_8);
+#   String encoded = new String(Base64.getEncoder().encode(data), StandardCharsets.UTF_8);
+#   System.out.println(encoded);
+# GPG_PASSPHRASE
+# GPG_KEY64 (base64)
+#   gpg --export-secret-keys --armor KEY_ID | openssl base64 | pbcopy
+# GRADLE_KEY
+# GRADLE_SECRET
+
+name: deploy
+on:
+  workflow_dispatch:
+    inputs:
+      to_publish:
+        description: 'What to publish'
+        required: true
+        default: 'all'
+        type: choice
+        options:
+          - all
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: deploy
+    env:
+      gh_token: ${{ secrets.GH_TOKEN }}
+      ORG_GRADLE_PROJECT_nexus_user: ${{ secrets.NEXUS_USER }}
+      ORG_GRADLE_PROJECT_nexus_pass64: ${{ secrets.NEXUS_PASS64 }}
+      ORG_GRADLE_PROJECT_gpg_passphrase: ${{ secrets.GPG_PASSPHRASE }}
+      ORG_GRADLE_PROJECT_gpg_key64: ${{ secrets.GPG_KEY64 }}
+    steps:
+      - uses: actions/checkout@v3
+      - name: jdk 11
+        uses: actions/setup-java@v3
+        with:
+          java-version: 11
+          distribution: 'temurin'
+      - name: gradle caching
+        uses: gradle/gradle-build-action@v2
+        with:
+          gradle-home-cache-cleanup: true
+      - name: git fetch origin main
+        run: git fetch origin main
+      - name: publish all
+        if: "${{ github.event.inputs.to_publish == 'all' }}"
+        run: |
+          ./gradlew :changelogPush -Prelease=true -Penable_publishing=true -Pgradle.publish.key=${{ secrets.GRADLE_KEY }} -Pgradle.publish.secret=${{ secrets.GRADLE_SECRET }} --stacktrace --warning-mode all

.github/workflows/gradle-wrapper-validation.yml

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+name: "Validate Gradle Wrapper"
+on:
+  push:
+    paths:
+      - 'gradlew'
+      - 'gradlew.bat'
+      - 'gradle/wrapper/'
+  pull_request:
+    paths:
+      - 'gradlew'
+      - 'gradlew.bat'
+      - 'gradle/wrapper/'
+
+permissions:
+  contents: read
+
+jobs:
+  validation:
+    name: "Validation"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: gradle/wrapper-validation-action@v1