Add linear check to PRs (onyx-dot-app#3708)

* add linear check

* Update pull_request_template.md

Author: pablonyx

.github/pull_request_template.md

@@ -1,11 +1,14 @@
 ## Description
-[Provide a brief description of the changes in this PR]
 
+[Provide a brief description of the changes in this PR]
 
 ## How Has This Been Tested?
-[Describe the tests you ran to verify your changes]
 
+[Describe the tests you ran to verify your changes]
 
 ## Backporting (check the box to trigger backport action)
+
 Note: You have to check that the action passes, otherwise resolve the conflicts manually and tag the patches.
+
 - [ ] This PR should be backported (make sure to check that the backport attempt succeeds)
+- [ ] [Optional] Override Linear Check

.github/workflows/pr-linear-check.yml

@@ -0,0 +1,29 @@
+name: Ensure PR references Linear
+
+on:
+  pull_request:
+    types: [opened, edited, reopened, synchronize]
+
+jobs:
+  linear-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check PR body for Linear link or override
+        run: |
+          PR_BODY="${{ github.event.pull_request.body }}"
+
+          # Looking for "https://linear.app" in the body
+          if echo "$PR_BODY" | grep -qE "https://linear\.app"; then
+            echo "Found a Linear link. Check passed."
+            exit 0
+          fi
+
+          # Looking for a checked override: "[x] Override Linear Check"
+          if echo "$PR_BODY" | grep -q "\[x\].*Override Linear Check"; then
+            echo "Override box is checked. Check passed."
+            exit 0
+          fi
+
+          # Otherwise, fail the run
+          echo "No Linear link or override found in the PR description."
+          exit 1