Use LE staging CA to verfiy fetched certs

See #60 for details.
For Ci droplets we use LE staging CA, so we need to provide curl
with the CA cert. Surprisingly, curl will still validate certs from
LE production CA even if "--cacert=./letsencrypt_fakelerootx1.pem" is
used.

.gitlab-ci.yml

@@ -46,7 +46,7 @@ bootstrap:
     # Run testinfra tests
     - py.test -v --ansible-inventory=./inventory.yml --connection=ssh --hosts='ansible://*'
     # Wait for proper LE cert to get served
-    - timeout -t 1200 sh -c 'while ! curl -s https://auth.ci-${CI_JOB_ID}.ci.openappstack.net/auth/ > /dev/null; do date; echo "Waiting for LE cert..."; sleep 5; done'
+    - timeout -t 1200 sh -c 'while ! curl --cacert ./letsencrypt_fakelerootx1.pem -s https://auth.ci-${CI_JOB_ID}.ci.openappstack.net/auth/ > /dev/null; do date; echo "Waiting for LE cert..."; sleep 5; done'
     # Run behave tests
     - cd behave/
     - behave -D keycloak.admin.url=https://auth.ci-${CI_JOB_ID}.ci.openappstack.net/auth/admin/master/console/ -D keycloak.admin.password=$(cat ../secrets/keycloak_admin_password)

test/letsencrypt_fakelerootx1.pem

+-----BEGIN CERTIFICATE-----
+MIIFATCCAumgAwIBAgIRAKc9ZKBASymy5TLOEp57N98wDQYJKoZIhvcNAQELBQAw
+GjEYMBYGA1UEAwwPRmFrZSBMRSBSb290IFgxMB4XDTE2MDMyMzIyNTM0NloXDTM2
+MDMyMzIyNTM0NlowGjEYMBYGA1UEAwwPRmFrZSBMRSBSb290IFgxMIICIjANBgkq
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+idWw1VrejtwclobqNMVtG3EiPUIpJGpbMcJgbiLSmKkrvQtGng==
+-----END CERTIFICATE-----