Add checkout and jdk setup to curseforge step

Author: robotgryphon

.github/workflows/test-build.yml

@@ -113,6 +113,14 @@ jobs:
       CF_TOKEN: ${{ secrets.CF_API_TOKEN }}
 
     steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+          
       - name: Download Build Results
         uses: actions/download-artifact@v2
         with: