Skip content pipeline PR if no docs changes (#60429)

Author: sarahs

.github/workflows/content-pipelines.yml

@@ -103,11 +103,11 @@ jobs:
           ID: ${{ matrix.id }}
         run: |
           git add content/ data/
-          git add "src/content-pipelines/state/${ID}.sha"
           if git diff --cached --quiet; then
             echo "has_changes=false" >> "$GITHUB_OUTPUT"
             echo "No documentation changes to commit"
           else
+            git add "src/content-pipelines/state/${ID}.sha"
             git commit -m "docs: update ${ID} content from source docs" \
               -m "Updated by the content-pipeline-update agent (${ID}) via GitHub Actions." \
               -m "Run: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"

src/content-pipelines/scripts/update.ts

@@ -224,6 +224,14 @@ async function main(): Promise<void> {
       diff = '(diff unavailable)'
     }
 
+    // No source doc files changed — skip the agent.
+    if (!nameStatus.startsWith('(') && !nameStatus.trim()) {
+      console.log(
+        `No changes in ${SOURCE_PATH} between ${storedSha.slice(0, 7)} and ${currentSha.slice(0, 7)}. Skipping agent run.`,
+      )
+      return
+    }
+
     diffContent = [
       `# Source doc changes (${storedSha.slice(0, 7)}..${currentSha.slice(0, 7)})`,
       '',