Merge pull request #88 from drone-plugins/CI-16417

[feat]: [CI-16417]: fallback source added

Author: Ompragash

plugin.yml

@@ -1,3 +1,4 @@
 run:
   binary:
-    source: https://github.com/drone-plugins/drone-gcs/releases/download/{{ release }}/plugin-{{ os }}-{{ arch }}.zst
+    source: https://github.com/drone-plugins/drone-gcs/releases/download/{{ release }}/plugin-{{ os }}-{{ arch }}.zst
+    fallback_source: https://app.harness.io/storage/harness-download/harness-ti/drone-gcs/{{ release }}/plugin-{{ os }}-{{ arch }}.zst