update GitHub Actions workflows for nightly builds and release publishing

.github/workflows/build_jar.yml

@@ -1,12 +1,8 @@
-name: Build and Upload JAR
+name: Nightly Builds
 
 on:
-  push:
-    branches:
-      - main
-  pull_request:
-    branches:
-      - main
+  schedule:
+    - cron: '0 0 * * *' # Runs at midnight UTC every day
 
 jobs:
   build:
@@ -28,8 +24,11 @@ jobs:
       - name: Build with Gradle
         run: ./gradlew build
 
+      - name: Rename build artifact
+        run: mv build/libs/*.jar build/libs/nuggetmod-nightly.jar
+
       - name: Upload build artifacts
         uses: actions/upload-artifact@v4.5.0
         with:
-          name: build-jar-mod
-          path: build/libs/*.jar
+          name: nuggetmod-nightly
+          path: build/libs/nuggetmod-nightly.jar

.github/workflows/publish.yml

@@ -0,0 +1,44 @@
+name: Build and Upload JAR
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4.6.0
+        with:
+          distribution: 'temurin'
+          java-version: '21'
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+
+      - name: Update mod_version in gradle.properties
+        run: |
+          sed -i "s/^mod_version=.*$/mod_version=${{ github.event.release.tag_name }}/" gradle.properties
+
+      - name: Build with Gradle
+        run: ./gradlew build
+
+      - name: Upload to Modrinth
+        uses: cloudnode-pro/modrinth-publish@2.0.0
+        with:
+          # Configure the action as needed. The following is an example.
+          token: ${{ secrets.MODRINTH_TOKEN }}
+          project: nuggetmod
+          name: ${{ github.event.release.name }}
+          version: ${{ github.event.release.tag_name }}
+          changelog: ${{ github.event.release.body }}
+          loaders: |-
+            forge
+          game-versions: |-
+            1.21.x
+          files: build/libs/*.jar