Merge pull request #35 from mithro/kokoro-letsencrypt-fix

Delete expired Let's Encrypt certificate.

.github/kokoro/steps/hostsetup.sh

@@ -17,6 +17,29 @@ echo "----------------------------------------"
 sudo apt-get remove -y cmake
 echo "----------------------------------------"
 
+echo
+echo "========================================"
+echo "Update the CA certificates"
+echo "----------------------------------------"
+sudo apt-get install -y ca-certificates
+echo "----------------------------------------"
+sudo update-ca-certificates
+echo "----------------------------------------"
+
+echo
+echo "========================================"
+echo "Remove the expire letsencrypt.org cert "
+echo "----------------------------------------"
+wget https://helloworld.letsencrypt.org/ || true
+echo "----------------------------------------"
+sudo rm /usr/share/ca-certificates/mozilla/DST_Root_CA_X3.crt
+echo "----------------------------------------"
+sudo update-ca-certificates
+echo "----------------------------------------"
+wget https://helloworld.letsencrypt.org/ || true
+echo "----------------------------------------"
+
+
 echo
 echo "========================================"
 echo "Host adding PPAs"