fix: retrigger CodeRabbit plan on unlock and log skip reason

Signed-off-by: Anshul Kushwaha <137977998+sudo-anshul@users.noreply.github.com>

Author: sudo-anshul

.github/workflows/bot-coderabbit-plan-trigger.yml

@@ -1,9 +1,10 @@
-# Triggers CodeRabbit's plan feature when a difficulty label is added to an issue.
-# Only fires for skill: beginner/intermediate/advanced labels, preventing duplicate runs.
+# Triggers CodeRabbit's plan feature for difficulty-labeled issues.
+# It runs when a difficulty label is added to an unlocked issue, and again when
+# a previously locked issue is unlocked (e.g. after triage approval).
 name: CodeRabbit Plan Trigger
 on:
   issues:
-    types: [labeled]
+    types: [labeled, unlocked]
 
 permissions:
   issues: write
@@ -15,22 +16,50 @@ jobs:
     concurrency:
       group: coderabbit-plan-${{ github.event.issue.number }}
       cancel-in-progress: false
-    # Only run when the newly added label is a difficulty label (skill: beginner/intermediate/advanced)
-    if: >
-      github.event.action == 'labeled' &&
-      github.event.issue.state == 'open' &&
-      contains(fromJson('["skill: beginner","skill: intermediate","skill: advanced"]'), github.event.label.name)
 
     steps:
       - name: Harden the runner
         uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
         with:
           egress-policy: audit
 
+      - name: Evaluate trigger conditions
+        id: should_run
+        run: echo "value=true" >> "$GITHUB_OUTPUT"
+        # Run only for open, unlocked issues that have beginner/intermediate/advanced difficulty.
+        if: >
+          github.event.issue.state == 'open' &&
+          github.event.issue.locked == false &&
+          (
+            (
+              github.event.action == 'labeled' &&
+              contains(fromJson('["skill: beginner","skill: intermediate","skill: advanced"]'), github.event.label.name)
+            ) ||
+            (
+              github.event.action == 'unlocked' &&
+              (
+                contains(github.event.issue.labels.*.name, 'skill: beginner') ||
+                contains(github.event.issue.labels.*.name, 'skill: intermediate') ||
+                contains(github.event.issue.labels.*.name, 'skill: advanced')
+              )
+            )
+          )
+
+      - name: Log skip context
+        if: steps.should_run.outputs.value != 'true'
+        run: |
+          echo "::notice::Skipping CodeRabbit plan trigger"
+          echo "::notice::action=${{ github.event.action }}"
+          echo "::notice::issue_state=${{ github.event.issue.state }}"
+          echo "::notice::issue_locked=${{ github.event.issue.locked }}"
+          echo "::notice::issue_labels=${{ join(github.event.issue.labels.*.name, ', ') }}"
+
       - name: Checkout repository
+        if: steps.should_run.outputs.value == 'true'
         uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 #v6.0.3
 
       - name: Trigger CodeRabbit Plan
+        if: steps.should_run.outputs.value == 'true'
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 #v9.0.0