Refine NSC promotion workflow

Author: AnastaZIuk

.github/workflows/promote-nsc-channel.yml

@@ -57,6 +57,9 @@ jobs:
           ref: ${{ inputs.target_branch }}
           fetch-depth: 0
           persist-credentials: false
+          sparse-checkout: |
+            tools/nsc/manifests
+          sparse-checkout-cone-mode: false
 
       - name: Resolve source run metadata
         id: source-run
@@ -140,15 +143,13 @@ jobs:
           - source run: ${RUN_URL}
           EOF
 
-          if gh release view "${RELEASE_TAG}" --repo "${ASSET_REPO}" >/dev/null 2>&1; then
-            gh release delete "${RELEASE_TAG}" --repo "${ASSET_REPO}" --cleanup-tag --yes
+          if ! gh release view "${RELEASE_TAG}" --repo "${ASSET_REPO}" >/dev/null 2>&1; then
+            gh release create "${RELEASE_TAG}" \
+              --repo "${ASSET_REPO}" \
+              --title "${RELEASE_TAG}" \
+              --notes-file "${notes_file}"
           fi
 
-          gh release create "${RELEASE_TAG}" \
-            --repo "${ASSET_REPO}" \
-            --title "${RELEASE_TAG}" \
-            --notes-file "${notes_file}"
-
           mapfile -d '' payload_assets < <(find "${RUNNER_TEMP}/nsc-payload" -maxdepth 1 -type f -print0)
           if [[ "${#payload_assets[@]}" -eq 0 ]]; then
             echo "No payload assets found in ${RUNNER_TEMP}/nsc-payload" >&2

docs/nsc-channel-promotion.md

@@ -93,4 +93,4 @@ For production use the defaults are:
 - `target_branch=master`
 - `asset_repo=Devsh-Graphics-Programming/Nabla-Asset-Manifests`
 
-For fork-hosted smoke tests the same workflow can run from a fork repository, read artifacts from an official branch such as `nsc-channel`, publish the release to `Nabla-Asset-Manifests`, and open a PR from the fork back to the requested upstream branch.
+For fork-hosted smoke tests the same workflow can run from a fork repository, read artifacts from a selected official branch, publish the release to `Nabla-Asset-Manifests`, and open a PR from the fork back to the requested upstream branch.