Add a new action

.github/workflows/web-crowdin-update.yml

@@ -0,0 +1,39 @@
+name: "Update Crowdin translations (web)"
+
+# This is a variant of web-crowdin.yml that also uploads the translated strings
+# (in addition to the source strings). This allows us to change the strings in
+# our source code for an automated refactoring (e.g. renaming a key), and then
+# run this workflow to update the data in Crowdin taking our source code as the
+# source of truth.
+
+on:
+    # Only allow running manually.
+    workflow_dispatch:
+
+jobs:
+    synchronize-with-crowdin:
+        runs-on: ubuntu-latest
+
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+
+            - name: Crowdin's action
+              uses: crowdin/github-action@v1
+              with:
+                  base_path: "web/"
+                  config: "web/crowdin.yml"
+                  upload_sources: true
+                  # This is what differs from web-crowdin.yml
+                  upload_translations: true
+                  download_translations: true
+                  localization_branch_name: translations/web
+                  create_pull_request: true
+                  skip_untranslated_strings: true
+                  pull_request_title: "[web] Updated translations"
+                  pull_request_body: "Updated translations from [Crowdin](https://crowdin.com/project/ente-photos-web)"
+                  pull_request_base_branch_name: "main"
+                  project_id: 569613
+              env:
+                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+                  CROWDIN_PERSONAL_TOKEN: ${{ secrets.CROWDIN_PERSONAL_TOKEN }}