add in changelog entry check

.github/workflows/_changelog-entry-check.yml

@@ -0,0 +1,57 @@
+name: "Changelog entry check"
+
+on:
+    workflow_call:
+        inputs:
+            package:
+                description: "Choose the package to test"
+                type: string
+                default: "dbt-adapters"
+            issue:
+                description: "The issue/PR number"
+                type: string
+                required: true
+
+permissions:
+    contents: read
+    pull-requests: write
+
+jobs:
+    changelog-check:
+        if: ${{ !contains(github.event.pull_request.labels.*.name, 'Skip Changelog') }}
+        outputs:
+            exists: ${{ steps.changelog.outputs.exists }}
+        runs-on: ubuntu-latest
+        steps:
+        -   id: changelog
+            uses: dorny/paths-filter@v3
+            with:
+                token: ${{ secrets.GITHUB_TOKEN }}
+                filters: |
+                    exists:
+                    -   added|modified: '${{ inputs.package }}/.changes/unreleased/**.yaml'
+
+    comment:
+        needs: changelog-check
+        if: needs.changelog-check.outputs.exists == false
+        runs-on: ubuntu-latest
+        env:
+            COMMENT: >-
+                Thank you for your pull request! We could not find a changelog entry for this change.
+                For details on how to document a change, see the
+                [Contributing Guide](https://github.com/dbt-labs/dbt-adapters/blob/main/CONTRIBUTING.md).
+        steps:
+        -   id: comment
+            uses: peter-evans/find-comment@v3
+            with:
+                issue-number: ${{ inputs.issue }}
+                comment-author: "github-actions[bot]"
+                body-includes: ${{ env.COMMENT }}
+        -   if: steps.comment.outputs.comment-body == ''
+            run: gh issue comment ${{ inputs.issue }} --repo ${{ github.repository }} --body "${{ env.COMMENT }}"
+            shell: bash
+            env:
+                GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        -   uses: actions/github-script@v7
+            with:
+                script: core.setFailed('Changelog entry required to merge.')

.github/workflows/pull-request-checks.yml

@@ -2,14 +2,19 @@ name: "Pull request checks"
 
 on:
     pull_request_target:
-        types: [opened, reopened, synchronize]
+        types: [opened, reopened, synchronize, labeled, unlabeled]
 
 # only run this once per PR at a time
 concurrency:
     group: ${{ github.workflow }}-${{ github.event.number }}
     cancel-in-progress: true
 
 jobs:
+    changelog-entry:
+        uses: ./.github/workflows/_changelog-entry-check.yml
+        with:
+            issue: ${{ github.event.pull_request.number }}
+
     code-quality:
         uses: ./.github/workflows/_code-quality.yml
         with: