Chore: CI apt caching for flakiness (#14647)

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Co-authored-by: Codex <267193182+codex@users.noreply.github.com>

.github/workflows/ci-backend.yml

@@ -77,6 +77,7 @@ jobs:
               - 'uv.lock'
               - 'docker/compose/docker-compose.ci-test.yml'
               - '.github/workflows/ci-backend.yml'
+              - '.github/actions/apt-install/**'
   test:
     needs: changes
     if: needs.changes.outputs.backend_changed == 'true'

.github/workflows/ci-frontend.yml

@@ -69,6 +69,7 @@ jobs:
             frontend:
               - 'src-ui/**'
               - '.github/workflows/ci-frontend.yml'
+              - '.github/actions/apt-install/**'
   install-dependencies:
     needs: changes
     if: needs.changes.outputs.frontend_changed == 'true'