CI: point to google.com for connectivity check

In our cloud builds sometimes the default connectivity check URL
(yoctoproject.org) returns an error. Point it to google.com to make sure
that the connectivity check errors are not caused by some
yoctoproject.org misconfiguration (or DoS protection).

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

.github/workflows/build-template.yml

@@ -53,6 +53,7 @@ jobs:
           local_conf:
             - INHERIT += 'buildstats buildstats-summary'
             - INHERIT:remove = 'rm_work'
+            - CONNECTIVITY_CHECK_URIS = "https://www.google.com/"
           artifacts: []
 
         rpb: &rpb