Bug 1730593 - disable browser_bfcache_copycommand.js on linux64 r=intermittent-reviewers,MasterWayZ DONTBUILD

Differential Revision: https://phabricator.services.mozilla.com/D131224

docshell/test/browser/browser.ini

@@ -229,3 +229,5 @@ https_first_disabled = true
 [browser_bug1716290-3.js]
 [browser_bug1716290-4.js]
 [browser_bfcache_copycommand.js]
+skip-if =
+  os == "linux" && bits == 64 # Bug 1730593