[Cherry-pick #979] Workspace fix for e2e tests

Author: 08volt

WORKSPACE

@@ -50,8 +50,11 @@ http_archive(
 
 http_archive(
     name = "io_bazel_rules_docker",
-    sha256 = "b1e80761a8a8243d03ebca8845e9cc1ba6c82ce7c5179ce2b295cd36f7e394bf",
-    urls = ["https://github.com/bazelbuild/rules_docker/releases/download/v0.25.0/rules_docker-v0.25.0.tar.gz"],
+    sha256 = "f6dcb97e992f13bc9effd794e9bb300f06b0dadc88061f81ae68d8d5994be964",
+    urls = [
+        "https://mirror.bazel.build/github.com/bazelbuild/rules_docker/releases/download/v0.26.0/rules_docker-v0.26.0.tar.gz",
+        "https://github.com/bazelbuild/rules_docker/releases/download/v0.26.0/rules_docker-v0.26.0.tar.gz",
+    ],
 )
 
 load("@bazel_skylib//lib:versions.bzl", "versions")