Add jitpack, build.yml

.github/workflows/build.yml

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+# Automatically build the project and run any configured tests for every push
+# and submitted pull request. This can help catch issues that only occur on
+# certain platforms or Java versions, and provides a first line of defence
+# against bad commits.
+
+name: build
+on: [ pull_request, push ]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        # Use these Java versions
+        java: [
+          21,    # Current Java LTS & minimum supported by Minecraft
+        ]
+        # and run on both Linux and Windows
+        os: [ ubuntu-20.04, windows-2022 ]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: checkout repository
+        uses: actions/checkout@v4
+      - name: validate gradle wrapper
+        uses: gradle/actions/wrapper-validation@v3
+      - name: setup jdk ${{ matrix.java }}
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: ${{ matrix.java }}
+      - name: make gradle wrapper executable
+        if: ${{ runner.os != 'Windows' }}
+        run: chmod +x ./gradlew
+      - name: build
+        run: ./gradlew build
+      - name: capture build artifacts
+        if: ${{ runner.os == 'Linux' }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: Artifacts
+          path: build/libs/

jitpack.yml

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+before_install:
+  - sdk install java 21.0.5-tem
+  - sdk use java 21.0.5-tem