Skip changelog check if label is present (#3687)

.github/workflows/changelog.yml

@@ -0,0 +1,28 @@
+name: changelog
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - labeled
+      - unlabeled
+
+concurrency:
+  group: changelog-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    if: ${{ !contains(github.event.pull_request.labels.*.name, 'ignore-changelog') }}
+    steps:
+      - uses: actions/checkout@v3
+      - name: Check diff
+        run: |
+          git fetch origin ${{ github.base_ref }} --depth=1
+          if git diff --exit-code origin/${{ github.base_ref }} -- CHANGELOG.md ; then
+            echo 'Missing changelog entry'
+            exit 1
+          fi
+

.github/workflows/checks.yml

@@ -13,19 +13,6 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  changelog:
-    if: github.event_name == 'pull_request' && github.repository != 'OpenZeppelin/openzeppelin-contracts-upgradeable'
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - name: Check diff
-        run: |
-          git fetch origin ${{ github.base_ref }} --depth=1
-          if git diff --exit-code origin/${{ github.base_ref }} -- CHANGELOG.md ; then
-            echo 'Missing changelog entry'
-            exit 1
-          fi
-
   lint:
     if: github.repository != 'OpenZeppelin/openzeppelin-contracts-upgradeable'
     runs-on: ubuntu-latest