Actions: Remove dependence on external actions

.github/workflows/check-change-note.yml

@@ -10,24 +10,14 @@ jobs:
   check-change-note:
     runs-on: ubuntu-latest
     steps:
-      - name: Check if change note file is present
-        uses: dorny/paths-filter@7c0f15b688b020e95e00f15c61299b022f08ca95 # v2.8.0
-        id: paths_filter
-        with:
-          filters: |
-            change_note:
-              - '**/change-notes/*.md'
-      - name: Get PR labels
-        id: pr-labels
-        uses: joerick/pr-labels-action@0a4cc4ee0ab557ec0b1ae1157fa6fa7f9f4c494b # v1.0.6
-      - name: Fail if change note is missing
-        uses: actions/github-script@v3
+      - uses: actions/checkout@v2
+      - name: Fail if no change note found. To fix, either add one, or add the `no-change-note-required` label.
         if: |
           github.event.pull_request.draft == false &&
-          steps.paths_filter.outputs.change_note == 'false' &&
-          !contains(steps.pr-labels.outputs.labels, ' no-change-note-required ')
-        with:
-          github-token: ${{secrets.GITHUB_TOKEN}}
-          script: |
-            core.setFailed('No change note found.' +
-            ' Either add one, or add the `no-change-note-required` label.')
+          !contains(github.event.pull_request.labels.*.name, 'no-change-note-required')
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh api 'repos/${{github.repository}}/pulls/${{github.event.number}}/files' --paginate |
+          jq '.[].filename' --raw-output |
+          grep '/change-notes/.*\.md$'