Add changenote directly in pre-commit workflow

.github/workflows/dependabot-changenote.yml

@@ -0,0 +1,44 @@
+name: Dependabot Change Note
+
+on:
+  workflow_call:
+
+permissions:
+  pull-requests: write
+
+jobs:
+  changenote:
+    name: Dependabot Change Note
+    if: github.actor == 'dependabot[bot]' && github.repository != 'beeware/.github'
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 1
+          token: ${{ secrets.BRUTUS_PAT_TOKEN }}
+
+      - name: Configure git
+        run: |
+          git config --local user.email "$(git log --pretty='%ae' -1)"
+          git config --local user.name "Dependabot[bot]"
+
+      - name: Commit Change Note
+        run: |
+          # Fetch PR number for commit from Github API
+          API_URL="${{ github.api_url }}/repos/${{ github.repository }}/commits/${{ github.event.head_commit.id }}/pulls"
+          PR_NUM=$(curl -s -H "Accept: application/vnd.github+json" "${API_URL}" | jq -r '.[].number')
+
+          # Create change note from first line of dependabot commit
+          NEWS=$(printf "%s" "${{ github.event.head_commit.message }}" | head -n1 | sed -e 's/Bump/Updated/')
+          printf "%s.\n" "${NEWS}" > "./changes/${PR_NUM}.misc.rst"
+
+          # Commit the change note
+          git add "./changes/${PR_NUM}.misc.rst"
+          # "dependabot skip" tells Dependabot to continue rebasing this branch despite foreign commits
+          git commit -m "Add changenote. [dependabot skip]"
+
+      - name: Push
+        run: git push origin

.github/workflows/pre-commit-update.yml

@@ -11,10 +11,18 @@ on:
         description: "The arguments for `pip install` to install pre-commit; use ./path/to/package[dev] for the repo's pinned version."
         default: '.[dev]'
         type: string
+      create-changenote:
+        description: "If 'true', creates a misc changenote in the './changes' directory."
+        default: true
+        type: boolean
 
 permissions:
   pull-requests: write
 
+env:
+  BRANCH_NAME: "autoupdates/pre-commit"
+  CHANGENOTE_DIR: "./changes"
+
 jobs:
   pre-commit-update:
     name: Update pre-commit
@@ -51,14 +59,38 @@ jobs:
         continue-on-error: true
         run: pre-commit run --all-files
 
+      - name: PR Needed?
+        id: pr
+        run: |
+          if [[ $(git status --porcelain) ]]; then
+            echo "needed=true" >> ${GITHUB_OUTPUT}
+          else
+            echo "needed=false" >> ${GITHUB_OUTPUT}
+          fi
+
       - name: Create Pull Request
+        id: created-pr
+        if: steps.pr.outputs.needed == 'true'
         uses: peter-evans/create-pull-request@v4.2.3
         with:
           token: ${{ secrets.BRUTUS_PAT_TOKEN }}
-          title: Auto-update `pre-commit` hooks
-          branch: autoupdates/pre-commit
-          commit-message: Auto-updated `pre-commit` hooks.
-          committer: Brutus (robot) <brutus@beeware.org>
-          author: Brutus (robot) <brutus@beeware.org>
-          body: Updated `pre-commit` hooks to their latest versions and ran updated hooks against the repo.
-          labels: dependencies
+          title: "Auto-update `pre-commit` hooks"
+          branch: ${{ env.BRANCH_NAME }}
+          commit-message: "Auto-updated `pre-commit` hooks."
+          committer: "Brutus (robot) <brutus@beeware.org>"
+          author: "Brutus (robot) <brutus@beeware.org>"
+          body: "Updated `pre-commit` hooks to their latest versions and ran updated hooks against the repo."
+          labels: "dependencies"
+
+      - name: Add changenote
+        if: (inputs.create-changenote == true) && (steps.created-pr.outputs.pull-request-number != '')
+        run: |
+          git fetch origin
+          git checkout ${{ env.BRANCH_NAME }}
+
+          FILENAME="${{ env.CHANGENOTE_DIR }}/${{ steps.created-pr.outputs.pull-request-number }}.misc.rst"
+          printf 'Updated ``pre-commit`` hooks to the latest version.\n' > "${FILENAME}" 
+
+          git add "${FILENAME}"          
+          git commit -m "Add changenote."
+          git push --set-upstream origin ${{ env.BRANCH_NAME }}