diff --git a/.github/workflows/build-fabric-1.21.8.yml b/.github/workflows/build-fabric-1.21.8.yml
new file mode 100644
index 000000000..fbcd5a71c
--- /dev/null
+++ b/.github/workflows/build-fabric-1.21.8.yml
@@ -0,0 +1,98 @@
+name: Build Fabric jar (Minecraft 1.21.8)
+
+on:
+  workflow_dispatch:
+    inputs:
+      create_release:
+        description: 'Create GitHub Release and upload built jar(s)? (true/false)'
+        required: false
+        default: 'false'
+      release_tag:
+        description: 'Release tag to use if creating a release (e.g. v1.21.8-build-001)'
+        required: false
+        default: 'v1.21.8-build-${{ github.run_id }}'
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    outputs:
+      artifact-name: fabric-1.21.8-jars
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Java 17 (Temurin)
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+          cache: 'gradle'
+
+      - name: Show Java info
+        run: java -version && javac -version
+
+      - name: Run Gradle build
+        # Adjust the Gradle task if your project builds a remapped jar with a different task (eg :fabric:remapJar)
+        run: ./gradlew clean build --no-daemon
+        env:
+          JAVA_HOME: ${{ runner.tool_cache }}/java
+
+      - name: List candidate jars
+        run: |
+          echo "Looking for jars produced by the build:"
+          find . -type f -name "*.jar" -not -path "*/.gradle/*" -maxdepth 6 -print || true
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: fabric-1.21.8-jars
+          path: |
+            **/build/libs/*.jar
+            **/fabric/build/libs/*.jar
+            **/mod/build/libs/*.jar
+
+  release:
+    needs: build
+    runs-on: ubuntu-latest
+    if: ${{ github.event.inputs.create_release == 'true' }}
+    steps:
+      - name: Download build artifacts
+        uses: actions/download-artifact@v4
+        with:
+          name: fabric-1.21.8-jars
+          path: ./artifact
+
+      - name: Create GitHub release
+        id: create_release
+        uses: actions/create-release@v1
+        with:
+          tag_name: ${{ github.event.inputs.release_tag }}
+          release_name: ${{ github.event.inputs.release_tag }}
+          body: "Automated build for Fabric / Minecraft 1.21.8 (generated by workflow)."
+          draft: false
+          prerelease: false
+
+      - name: Install GitHub CLI
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y gh
+      - name: Upload jars to release
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          echo "Uploading jars found in ./artifact to release ${{ github.event.inputs.release_tag }} ..."
+          ls -la ./artifact || true
+          # Upload all jars present under ./artifact
+          set -e
+          JARS=$(find ./artifact -type f -name "*.jar" -print)
+          if [ -z "$JARS" ]; then
+            echo "No jars found to upload. Exiting."
+            exit 1
+          fi
+          for jar in $JARS; do
+            echo "Uploading $jar"
+            gh release upload "${{ github.event.inputs.release_tag }}" "$jar" --clobber
+          done