Add CI workflows for build and release

.github/workflows/build.yml

@@ -0,0 +1,38 @@
+name: Build
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+permissions:
+  contents: read
+
+concurrency:
+  group: build-${{ github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '21'
+          cache: maven
+
+      - name: Build with Maven
+        run: mvn -B --no-transfer-progress package
+
+      - name: Upload JAR
+        uses: actions/upload-artifact@v4
+        with:
+          name: SMP-jar
+          path: target/*.jar
+          if-no-files-found: error

.github/workflows/release.yml

@@ -0,0 +1,43 @@
+name: Release
+
+on:
+  push:
+    tags: ['release-*']
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '21'
+          cache: maven
+
+      - name: Verify tag matches pom.xml version
+        run: |
+          POM_VERSION=$(mvn -B -q help:evaluate -Dexpression=project.version -DforceStdout)
+          TAG_VERSION="${GITHUB_REF_NAME#release-}"
+          echo "pom.xml version: $POM_VERSION"
+          echo "Tag version:     $TAG_VERSION"
+          if [ "$POM_VERSION" != "$TAG_VERSION" ]; then
+            echo "::error::Tag '$GITHUB_REF_NAME' does not match pom.xml version '$POM_VERSION'"
+            exit 1
+          fi
+
+      - name: Build with Maven
+        run: mvn -B --no-transfer-progress package
+
+      - name: Publish Release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: target/*.jar
+          generate_release_notes: true
+          fail_on_unmatched_files: true

pom.xml

@@ -8,7 +8,7 @@
         <!-- PaperMC -->
         <repository>
             <id>papermc</id>
-            <url>https://papermc.io/repo/repository/maven-public/</url>
+            <url>https://repo.papermc.io/repository/maven-public/</url>
         </repository>
         <!-- Plugin: CoreProtect -->
         <repository>