chore: Add new pasteurbot automation from upstream (#43)

Use PasteurBot account instead of GH Actions default.

Author: dionhaefner

.github/workflows/bump_lockfile.yml

@@ -46,7 +46,9 @@ jobs:
         if: steps.git-diff.outputs.update_done == 'true'
         uses: peter-evans/create-pull-request@v7
         with:
-            token: ${{ secrets.GITHUB_TOKEN }}
+            token: ${{ secrets.PL_PASTEURBOT_PAT_PUBLIC }}
+            committer: PasteurBot <${{ vars.PL_PASTEURBOT_EMAIL }}>
+            author: PasteurBot <${{ vars.PL_PASTEURBOT_EMAIL }}>
             commit-message: Update dependencies
             title: "chore: 📦 Update dependencies"
             branch: _bot/update-deps
@@ -55,5 +57,3 @@ jobs:
             body: |
               This PR updates the lockfile to the latest versions of the dependencies.
               Please review the changes and merge when ready.
-
-              To trigger CI checks, please close and reopen this PR.

.github/workflows/pre-commit-cron-updater.yml

@@ -58,21 +58,34 @@ jobs:
 
     - name: Create Pull Request (all good)
       if: steps.pre-commit.outputs.pre-commit-outcome == 'success'
+      id: create-pr-ok
       uses: peter-evans/create-pull-request@v7
       with:
-          token: ${{ secrets.GITHUB_TOKEN }}
+          token: ${{ secrets.PL_PASTEURBOT_PAT_PUBLIC }}
+          committer: PasteurBot <${{ vars.PL_PASTEURBOT_EMAIL }}>
+          author: PasteurBot <${{ vars.PL_PASTEURBOT_EMAIL }}>
           commit-message: Update pre-commit hooks
           title: "chore: ✅ Update pre-commit hooks"
           branch: _bot/update-precommit
           draft: false
           body: |
             Pre-commit hooks have been updated successfully without conflicts.
 
+    - name: Enable auto-merge
+      if: steps.create-pr-ok.outputs.pull-request-operation == 'created'
+      uses: peter-evans/enable-pull-request-automerge@v3
+      with:
+          token: ${{ secrets.PL_PASTEURBOT_PAT_PUBLIC }}
+          pull-request-number: ${{ steps.create-pr-ok.outputs.pull-request-number }}
+          merge-method: squash
+
     - name: Create Pull Request (conflicts)
       if: steps.pre-commit.outputs.pre-commit-outcome == 'failure'
       uses: peter-evans/create-pull-request@v7
       with:
-          token: ${{ secrets.GITHUB_TOKEN }}
+          token: ${{ secrets.PL_PASTEURBOT_PAT_PUBLIC }}
+          committer: PasteurBot <${{ vars.PL_PASTEURBOT_EMAIL }}>
+          author: PasteurBot <${{ vars.PL_PASTEURBOT_EMAIL }}>
           commit-message: Update pre-commit hooks
           title: "chore: ⚠️ Update pre-commit hooks [review required]"
           branch: _bot/update-precommit