Move to GitHub actions for builds.

* Added a GH action for building Maven.
* Added a GH action for building Gradle.
* Remove old CI build.

Author: SoftlySplinter

.github/workflows/gradle.yml

@@ -0,0 +1,44 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+# This workflow will build a Java project with Gradle and cache/restore any dependencies to improve the workflow execution time
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-java-with-gradle
+
+name: Java CI with Gradle
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    name: Build Gradle
+    
+    runs-on: ubuntu-latest
+    continue-on-error: ${{ matrix.experimental }}
+    strategy:
+      matrix:
+        jdk: [8, 11]
+        experimental: [false]
+        include:
+          - jdk: 17
+            experimental: true
+        
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up JDK ${{ matrix.jdk }}
+      uses: actions/setup-java@v4
+      with:
+        java-version: ${{ matrix.jdk }}
+        distribution: 'semeru'
+    - name: Build with Gradle
+      uses: gradle/gradle-build-action@bd5760595778326ba7f1441bcf7e88b49de61a25 # v2.6.0
+      with:
+        arguments: build

.github/workflows/maven.yml

@@ -0,0 +1,40 @@
+# This workflow will build a Java project with Maven, and cache/restore any dependencies to improve the workflow execution time
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-java-with-maven
+
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: Java CI with Maven
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    name: Build Maven
+    
+    runs-on: ubuntu-latest
+    continue-on-error: ${{ matrix.experimental }}
+    strategy:
+      matrix:
+        jdk: [8, 11]
+        experimental: [false]
+        include:
+          - jdk: 17
+            experimental: true
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up JDK ${{ matrix.jdk }}
+      uses: actions/setup-java@v3
+      with:
+        java-version: ${{ matrix.jdk }}
+        distribution: 'semeru'
+        cache: maven
+    - name: Build with Maven
+      run: mvn --batch-mode --update-snapshots --file pom.xml -Djava.version=${{ matrix.jdk }} package