docs: update existing PR comments example

README.md

@@ -113,6 +113,17 @@ steps:
   with:
     github-token: ${{ secrets.GITHUB_TOKEN }}
     script: |
+      // 1. Retrieve existing bot comments for the PR
+      const { data: comments } = await github.rest.issues.listComments({
+        owner: context.repo.owner,
+        repo: context.repo.repo,
+        issue_number: context.issue.number,
+      })
+      const botComment = comments.find(comment => {
+        return comment.user.type === 'Bot' && comment.body.includes('Terraform Format and Style')
+      })
+
+      // 2. Prepare format of the comment
       const output = `#### Terraform Format and Style 🖌\`${{ steps.fmt.outcome }}\`
       #### Terraform Initialization ⚙️\`${{ steps.init.outcome }}\`
       #### Terraform Validation 🤖\`${{ steps.validate.outcome }}\`
@@ -135,13 +146,23 @@ steps:
       </details>
       
       *Pusher: @${{ github.actor }}, Action: \`${{ github.event_name }}\`, Working Directory: \`${{ env.tf_actions_working_dir }}\`, Workflow: \`${{ github.workflow }}\`*`;
-        
-      github.rest.issues.createComment({
-        issue_number: context.issue.number,
-        owner: context.repo.owner,
-        repo: context.repo.repo,
-        body: output
-      })
+      
+      // 3. If we have a comment, update it, otherwise create a new one
+      if (botComment) {
+        github.rest.issues.updateComment({
+          owner: context.repo.owner,
+          repo: context.repo.repo,
+          comment_id: botComment.id,
+          body: output
+        })
+      } else {
+        github.rest.issues.createComment({
+          issue_number: context.issue.number,
+          owner: context.repo.owner,
+          repo: context.repo.repo,
+          body: output
+        })
+      }
 ```
 
 ## Inputs