build(deps): bump nginxinc/docs-actions/.github/workflows/docs-build-push.yml

Bumps [nginxinc/docs-actions/.github/workflows/docs-build-push.yml](https://github.com/nginxinc/docs-actions) from 1.0.13 to 1.0.15.
- [Release notes](https://github.com/nginxinc/docs-actions/releases)
- [Commits](nginxinc/docs-actions@54da3ca...87da992)

---
updated-dependencies:
- dependency-name: nginxinc/docs-actions/.github/workflows/docs-build-push.yml
  dependency-version: 1.0.15
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/build-push.yml

@@ -58,7 +58,7 @@ jobs:
 
   call-docs-build-push:
     needs: prod-check-branch
-    uses: nginxinc/docs-actions/.github/workflows/docs-build-push.yml@54da3ca1694da6ce34840123a133054d847efcd6 # v1.0.13
+    uses: nginxinc/docs-actions/.github/workflows/docs-build-push.yml@87da99295dcb424d92efb2f6d783cc02e7c8da43 # v1.0.15
     with:
       production_url_path: ""
       preview_url_path: "${{ vars.PREVIEW_URL_PATH }}"