Add GitHub Actions workflow for building project

Author: Technofied

.github/workflows /build.yml

@@ -0,0 +1,53 @@
+name: Build
+
+on:
+  push:
+    branches: [main, master, develop]
+  pull_request:
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v5
+        with:
+          distribution: temurin
+          java-version: '21'
+
+      - name: Set up Gradle
+        uses: gradle/actions/setup-gradle@v6
+
+      - name: Build
+        run: |
+          chmod +x ./gradlew
+          ./gradlew shadowJar
+
+      - name: Collect JARs
+        run: |
+          mkdir -p jars
+          find . -path "*/build/libs/*.jar" -type f \
+            ! -name "*-sources.jar" \
+            ! -name "*-javadoc.jar" \
+            ! -name "*-tests.jar" \
+            ! -name "*-plain.jar" \
+            -exec cp {} jars/ \;
+
+      - name: Upload JARs
+        uses: actions/upload-artifact@v6
+        with:
+          name: jars-${{ github.sha }}
+          path: jars/*.jar
+          if-no-files-found: error
+          retention-days: 14