Migrate CI from Travis CI to GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,53 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+    tags: ['*']
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+          cache: 'maven'
+
+      - name: Run tests
+        run: mvn clean verify
+
+  deploy:
+    name: Deploy
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push' && github.repository_owner == 'alfasoftware'
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+          cache: 'maven'
+
+      - name: Import GPG keys
+        run: |
+          echo "$GPG_SECRET_KEYS" | base64 --decode | gpg --batch --import
+          echo "$GPG_OWNERTRUST" | base64 --decode | gpg --batch --import-ownertrust
+        env:
+          GPG_SECRET_KEYS: ${{ secrets.GPG_SECRET_KEYS }}
+          GPG_OWNERTRUST: ${{ secrets.GPG_OWNERTRUST }}
+
+      - name: Deploy to Maven Central
+        run: mvn clean deploy --settings .maven-settings.xml -B -U -Prelease