CI: fix bump after update

Author: boozook

.github/workflows/update.yml

@@ -131,7 +131,8 @@ jobs:
           echo "Base branch: ${{ needs.new-branch.outputs.base }}"
           echo "Working branch: ${{ needs.new-branch.outputs.working }}"
 
-      - uses: actions/checkout@v4
+      - name: Checkout
+        uses: actions/checkout@v4
         with:
           ref: ${{ needs.new-branch.outputs.working }}
 
@@ -224,11 +225,49 @@ jobs:
           echo "Pushed: ${{ steps.commit.outputs.pushed }}"
           echo "SHA: ${{ steps.commit.outputs.commit_sha }}"
 
+  changes:
+    name: Changes
+    needs: [new-branch, pre-gen]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ needs.new-branch.outputs.working }}
+          fetch-depth: 10
+
+      # Maybe better just checkout and then
+      # git rev-list --ancestry-path ${{ needs.new-branch.outputs.base || github.event.repository.default_branch }}..${{ needs.new-branch.outputs.working }}
+      # It's faster, simplier and less deps.
+      - name: Changes
+        id: changes
+        continue-on-error: true
+        uses: tj-actions/changed-files@v44
+        with:
+          skip_initial_fetch: "false"
+          sha: ${{ needs.new-branch.outputs.working }}
+          base_sha: ${{ needs.new-branch.outputs.base || github.event.repository.default_branch }}
+
+      - name: List changed files
+        if: steps.changes.outcome == 'success'
+        env:
+          ALL_CHANGED_FILES: ${{ steps.changes.outputs.all_changed_files }}
+        run: |
+          for file in ${ALL_CHANGED_FILES}; do
+            echo "$file was changed"
+          done
+
+    outputs:
+      changes: ${{ steps.changes.outputs.all_changed_files }}
+      changed: ${{ steps.changes.outputs.all_changed_files && 'true' || ' ' }}
+
+
   bump:
     name: Bump
-    needs: [new-branch, pre-gen]
+    needs: [new-branch, pre-gen, changes]
     runs-on: ubuntu-latest
     continue-on-error: true # Workspaces are not supported yet
+    if: needs.changes.outputs.changed == 'true'
     defaults:
       run:
         shell: bash
@@ -307,7 +346,8 @@ jobs:
 
   tests:
     name: Tests
-    needs: [new-branch, pre-gen]
+    needs: [new-branch, pre-gen, changes]
+    if: needs.changes.outputs.changed == 'true'
     uses: ./.github/workflows/tests.yml
     secrets: inherit
     permissions: