build: skip for automated PRs and run only when opened

Author: Planeshifter

.github/workflows/check_contributing_guidelines_acceptance.yml

@@ -40,7 +40,7 @@ on:
 
   # Trigger on pull request events:
   pull_request_target:
-    types: [opened, edited, synchronize, reopened]
+    types: [opened, reopened]
 
 # Global permissions:
 permissions:
@@ -53,15 +53,18 @@ permissions:
 # Workflow jobs:
 jobs:
 
-  # Define a job for checking the contributing guidelines acknowledgment...
+  # Define a job for checking the contributing guidelines acceptance...
   check_acknowledgment:
 
     # Define a display name:
-    name: 'Check Contributing Guidelines Acknowledgment'
+    name: 'Check Contributing Guidelines Acceptance'
 
     # Define the type of virtual host machine:
     runs-on: ubuntu-latest
 
+    # Skip this job for PRs opened by the stdlib-bot:
+    if: github.event.pull_request.user.login != 'stdlib-bot'
+
     # Define the sequence of job steps...
     steps:
       # Checkout the repository: