Implement CI

.github/workflows/ci.yml

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+name: Java CI with Gradle
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        jdk-version: [8, 11, 17]
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up JDK
+        uses: actions/setup-java@v3
+        with:
+          java-version: ${{ matrix.jdk-version }}
+          distribution: temurin
+      - name: Make gradlew executable
+        run: chmod +x gradlew
+      - name: Build with Gradle
+        uses: gradle/gradle-build-action@67421db6bd0bf253fb4bd25b31ebb98943c375e1
+        with:
+          arguments: test
+      - name: Process Errors
+        uses: dorny/test-reporter@v1
+        if: success() || failure()
+        with:
+          name: Gradle test (Java ${{matrix.jdk-version}})
+          path: build/test-results/test/*.xml
+          reporter: java-junit

.github/workflows/error-filter.py

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+#!/usr/bin/python3
+import sys
+import re
+
+_in = sys.stdin.read()
+for match in re.finditer(r"(\S+\.(\w+)) > (\S+) FAILED\n\s*(.*)(?:.*\n)*?.*\(\2\.java:(\d+)", _in):
+    file = 'src/test/java/' + match[1].replace('.', '/') + '.java'
+    line = match[5]
+    title = match[3]
+    message = match[4]
+    print(f"::error file={file},line={line},title=Failed in {title}::{message}")