Add workflow

.forgejo/workflows/build.yml

@@ -0,0 +1,20 @@
+on: [push]
+jobs:
+  deploy:
+    runs-on: docker
+    container: debian:sid
+    steps:
+      - name: Prepare for installation
+        run: apt update
+      - name: Install JDK
+        run: apt install --no-install-recommends -y openjdk-21-jdk-headless maven git
+
+      - name: Clone repository
+        run: git clone https://git.m724.eu/Minecon724/realweather.git .
+
+      - name: Build
+        run: mvn clean package
+      - name: Upload artifacts
+        uses: https://github.com/actions/upload-artifact@v3
+        with:
+          path: target/realweather-*.jar