bug 1518679 - install 32-bit libsecret so secret storage tests can use libsecret on 32-bit test systems r=jmaher

Differential Revision: https://phabricator.services.mozilla.com/D16085

--HG--
extra : moz-landing-system : lando

security/manager/ssl/tests/unit/test_oskeystore.js

@@ -113,8 +113,9 @@ add_task(async function() {
   await encrypt_decrypt_test();
   await delete_all_secrets();
 
-  if (AppConstants.platform == "macosx" || AppConstants.platform == "win") {
-    ok(!keystore.isNSSKeyStore, "OS X and Windows should use the non-NSS implementation");
+  if (AppConstants.platform == "macosx" || AppConstants.platform == "win" ||
+      AppConstants.platform == "linux") {
+    ok(!keystore.isNSSKeyStore, "OS X, Windows, and Linux should use the non-NSS implementation");
   }
 
   if (keystore.isNSSKeyStore) {

taskcluster/docker/recipes/ubuntu1604-test-system-setup.sh

@@ -71,6 +71,7 @@ apt_packages+=('wget')
 apt_packages+=('xvfb')
 apt_packages+=('yasm')
 apt_packages+=('zip')
+apt_packages+=('libsecret-1-0:i386')
 
 # get xvinfo for test-linux.sh to monitor Xvfb startup
 apt_packages+=('x11-utils')