Added Gitea Actions workflow for building plugin JAR artifact.

.gitea/workflows/build.yml

@@ -0,0 +1,24 @@
+name: Build Plugin JAR File
+on: [push]
+
+jobs:
+  Build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Java environment
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+
+      - name: Build artifact
+        run: chmod +x ./gradlew && ./gradlew build --no-daemon
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: Plugin JAR
+          path: build/libs/Snowbrawl-2.jar