ci: fix YAML, enable PR builds, upload artifacts

Author: jamjet3

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Set up Temurin JDK 21
         uses: actions/setup-java@v4
         with:
-          distribution: 'temurin'
+          distribution: temurin
           java-version: '21'
 
       - name: Setup Gradle
@@ -29,13 +29,12 @@ jobs:
       - name: Make gradlew executable
         run: chmod +x gradlew
 
-      # Build the fat jar with our custom task
-      - name: Build
+      - name: Build (uberJar)
         run: ./gradlew --no-daemon clean uberJar
 
-      # Publish the jar as a CI artifact for convenience
-      - name: Upload artifact
+      - name: Upload build artifact
         uses: actions/upload-artifact@v4
         with:
-          name: modnvote-jar
+          name: modnvote-${{ github.run_number }}
           path: build/libs/*.jar
+          if-no-files-found: error