[GithubActions] Enable image caching when not using self-hosted runners

.github/workflows/test.yaml

@@ -51,7 +51,8 @@ jobs:
     name: Pull all needed docker images and cache them (if dbs have not changed)
     runs-on: ubuntu-latest
     if: |
-      !cancelled() && !failure() && false &&
+      !cancelled() && !failure() &&
+      ${{ runner.name != 'self-hosted' }} &&
       !(
         needs.check_updater_changed.outputs.has_updater_changed == 'true' ||
         needs.check_migration_files.outputs.kone_db_migrations == 'true' ||
@@ -352,7 +353,9 @@ jobs:
   cache_cypress_image:
     runs-on: ubuntu-latest
     if: |
-      !cancelled() && !failure() && false
+      !cancelled() && !failure() &&
+      ${{ runner.name != 'self-hosted' }}
+
     steps:
       - name: Set up cache for Cypress image (saved in Post-step)
         id: cache-cypress-image