Try that

.forgejo/workflows/build.yml

@@ -4,24 +4,29 @@ jobs:
     runs-on: docker
     container: debian:sid
     steps:
-      - name: Prepare for installation
-        run: apt update
       - name: Install JDK and other deps
-        run: apt install --no-install-recommends -y openjdk-21-jdk-headless maven git nodejs curl zstd
+        run: apt update && apt install --no-install-recommends -y openjdk-21-jdk-headless maven git nodejs curl zstd
 
       - name: Clone repository
         run: git clone -b ${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}} https://git.m724.eu/Minecon724/tweaks724.git .
 
-      #- name: BuildTools for NMS
-     #   run: mkdir /tmp/buildtools && cd /tmp/buildtools && curl -O https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/artifact/target/BuildTools.jar && java -jar BuildTools.jar --rev 1.21.1 --remapped && cd
-
       - name: Download NMS
         run: ./tools/download_nms.sh ~
 
+
+
       - name: Build for 1.21.1
-        run: mvn clean package
+        run: mkdir artifact && mvn clean package && mv target/*.jar artifact/
+
+      - name: Build for 1.21.3
+        run: mvn clean package -Dproject.spigot.version=1.21.3-R0.1-SNAPSHOT && mv target/*.jar artifact/
+
+      - name: Build for 1.21.4
+        run: mvn clean package -Dproject.spigot.version=1.21.4-R0.1-SNAPSHOT && mv target/*.jar artifact/
+
+
 
       - name: Upload artifacts
         uses: https://github.com/actions/upload-artifact@v3
         with:
-          path: target
+          path: artifact

pom.xml

@@ -20,6 +20,7 @@
     </properties>
 
     <build>
+        <finalName>${artifactId}-${version}+${project.spigot.version}</finalName>
         <resources>
             <resource>
                 <directory>src/main/resources</directory>