feat: add workflow for sync from dtk5

  add workflow.

.github/workflows/call-synchronize-to-dtk6.yml

@@ -0,0 +1,19 @@
+name: Call synchronize to dtk6
+on:
+  pull_request_target:
+    paths-ignore:
+      - "debian/**"
+      - "archlinux/**"
+      - "rpm/**"
+      - ".obs/**"
+      - ".github/**"
+
+jobs:
+  call-synchronize:
+    uses: linuxdeepin/dtk/.github/workflows/synchronize-to-dtk6.yml@master
+    secrets: inherit
+    with:
+      dest_repo: linuxdeepin/qt6platform-plugins
+      source_repo: ${{ github.event.pull_request.head.repo.full_name }}
+      source_ref: ${{ github.event.pull_request.head.ref }}
+      pull_number: ${{ github.event.pull_request.number }}

.syncexclude

@@ -0,0 +1,10 @@
+# Paths that will be exclude from synchronize workflow
+# Please use relative path which use project directory as root
+# Notice that
+#   * .git
+#   * debian
+#   * archlinux
+#   * .obs
+#   * .github
+# are always ignored
+linglong.yaml