Merge pull request #448 from NASA-Openscapes/fix-deploy-preview-url

deploy preview: ensure PR # is in the URL

Author: ateucher

.github/workflows/deploy-preview.yml

@@ -81,7 +81,7 @@ jobs:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           deploy-message:
             'Deploy from GHA: ${{ github.event.pull_request.title || github.event.head_commit.message }} (${{ github.sha }})'
-          alias: deploy-preview-${{ github.event.number }}
+          alias: deploy-preview-${{ github.event.pull_request.number || github.event.issue.number }}
           # these all default to 'true'
           enable-pull-request-comment: true
           enable-commit-comment: false