ci: add Java compile check

Author: BryanBlaze00

.github/workflows/java-compile.yml

@@ -0,0 +1,17 @@
+name: Java compile check
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  compile:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: "17"
+      - name: Compile source
+        run: mkdir -p build/classes && javac -d build/classes $(find src -name "*.java")