Fix CI: checkout was overwriting downloaded JAR artifact

- Move checkout before artifact download
- Download artifact to ./artifacts subdirectory to prevent conflicts

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: cryptobench

.github/workflows/build.yml

@@ -40,19 +40,19 @@ jobs:
       contents: write
 
     steps:
+      - name: Checkout for commit info
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
       - name: Download artifact
         uses: actions/download-artifact@v4
         with:
           name: EasyWebMap
-          path: .
+          path: ./artifacts
 
       - name: List downloaded files
-        run: ls -la
-
-      - name: Checkout for commit info
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
+        run: ls -la ./artifacts
 
       - name: Generate version
         id: version
@@ -68,8 +68,7 @@ jobs:
 
       - name: Rename JAR
         run: |
-          # Find the JAR wherever it is
-          JAR_FILE=$(find . -name "EasyWebMap-*.jar" -type f | head -1)
+          JAR_FILE=$(find ./artifacts -name "EasyWebMap-*.jar" -type f | head -1)
           echo "Found JAR: $JAR_FILE"
           mv "$JAR_FILE" EasyWebMap-${{ steps.version.outputs.version }}.jar