Add extraction step for prebuilds in CI workflow

Author: devm33

.github/workflows/ci.yml

@@ -119,6 +119,20 @@ jobs:
         ls prebuilds/
       name: List prebuilds
 
+    # untar each prebuild file named *<platform>-<arch>.tar.gz
+    # and move its build/Release/ contents to a directory <platform>-<arch>/
+    - run: |
+        for f in *.tar.gz; do
+          platform_arch="${f%.tar.gz}"
+          platform_arch="${platform_arch##*-v3-}"
+          mkdir -p "$platform_arch"
+          tar -xzf "$f" -C "$platform_arch" --strip-components=2
+        done
+        rm *.tar.gz
+      name: Extract prebuilds
+      shell: bash
+      working-directory: prebuilds
+
     - name: Upload prebuilds to GitHub
       run: npx prebuild --verbose --upload-all ${{ secrets.GITHUB_TOKEN }}
       if: github.event_name == 'push' && contains(github.ref, 'refs/tags/')