CI: single nightly release (nightly tag) instead of per-push dev tags

Made-with: Cursor

.github/workflows/build-and-release.yml

@@ -3,6 +3,10 @@ name: Build and Release
 on:
   push:
 
+concurrency:
+  group: nightly-release-${{ github.repository }}
+  cancel-in-progress: true
+
 jobs:
   build-and-release:
     runs-on: ubuntu-latest
@@ -22,19 +26,35 @@ jobs:
       - name: Build zip package
         run: make zip
 
-      - name: Get version
-        id: version
-        run: echo "tag_name=dev-$(date +'%Y%m%d-%H%M%S')-${GITHUB_SHA::8}" >> $GITHUB_OUTPUT
+      - name: Nightly release (single tag, updated in place)
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          set -euo pipefail
+          TAG=nightly
+          ZIP="./output/OmniNX Downloader.zip"
+          REPO="${{ github.repository }}"
+          SHA="${{ github.sha }}"
+          REF="${{ github.ref_name }}"
 
-      - name: Create dev release
-        uses: softprops/action-gh-release@v1
-        with:
-          tag_name: ${{ steps.version.outputs.tag_name }}
-          name: Release ${{ steps.version.outputs.tag_name }}
-          body: |
-            Automated dev build of OmniNX Downloader
-            Commit: ${{ github.sha }}
-            Branch: ${{ github.ref_name }}
-          draft: false
-          prerelease: true
-          files: ./output/OmniNX Downloader.zip
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git tag -f "$TAG"
+          git push origin "refs/tags/$TAG" --force
+
+          NOTES="Single nightly build artifact (updated every push).
+
+          **Commit:** \`${SHA}\`
+          **Branch:** \`${REF}\`
+          **Built:** $(date -u '+%Y-%m-%d %H:%M:%S UTC')"
+
+          if gh release view "$TAG" --repo "$REPO" >/dev/null 2>&1; then
+            gh release upload "$TAG" "$ZIP" --clobber --repo "$REPO"
+            gh release edit "$TAG" --title "Nightly" --notes "$NOTES" --prerelease --repo "$REPO"
+          else
+            gh release create "$TAG" "$ZIP" \
+              --title "Nightly" \
+              --notes "$NOTES" \
+              --prerelease \
+              --repo "$REPO"
+          fi