use registry mirror for docker-in-docker (#13438) (#13446)

Co-authored-by: Lauris BH <lauris@nix.lv>

Co-authored-by: Lauris BH <lauris@nix.lv>

.drone.yml

@@ -652,7 +652,6 @@ steps:
       event:
         exclude:
         - pull_request
-
 ---
 kind: pipeline
 name: docker-linux-arm64-dry-run
@@ -682,6 +681,9 @@ steps:
       tags: linux-arm64
       build_args:
         - GOPROXY=off
+    environment:
+      PLUGIN_MIRROR:
+        from_secret: plugin_mirror
     when:
       event:
         - pull_request
@@ -726,11 +728,13 @@ steps:
         from_secret: docker_password
       username:
         from_secret: docker_username
+    environment:
+      PLUGIN_MIRROR:
+        from_secret: plugin_mirror
     when:
       event:
         exclude:
         - pull_request
-
 ---
 kind: pipeline
 name: docker-manifest