dedup variables

Author: ignatiusmb

.github/workflows/release.yaml

@@ -41,12 +41,18 @@ jobs:
       - if: github.event_name == 'pull_request'
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_NUMBER: ${{ github.event.number }}
+          WORKFLOW: ${{ github.repository }}/actions/runs/${{ github.run_id }}/artifacts
         run: |
-          id=$(gh api repos/${{ github.repository }}/actions/runs/${{ github.run_id }}/artifacts --jq '.artifacts[0].id')
-          url=https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}/artifacts/$id
-          comment="Try the changes in this PR by [side-loading the built extension]($url). :rocket:"
+          url=https://github.com/$WORKFLOW/$(gh api repos/$WORKFLOW --jq '.artifacts[0].id')
+          commented=$(gh pr view $PR_NUMBER --json comments --jq '.comments[].author.login | select(. | contains("github-actions"))')
+          body="Try the changes in this PR by [side-loading the built extension]($url). :rocket:"
 
-          gh pr comment ${{ github.event.pull_request.number }} --body "$comment"
+          if [ -z "$commented" ]; then
+            gh pr comment $PR_NUMBER --body "$body"
+          else
+            gh pr comment $PR_NUMBER --edit-last --body "$body"
+          fi
 
   publish:
     runs-on: ubuntu-latest