add compatibility tests to travis

tox.ini

@@ -79,7 +79,6 @@ commands =
     pip install -e acme -e .[dev] -e certbot-apache -e certbot-nginx -e certbot-compatibility-test -e letshelp-certbot
     {toxinidir}/certbot-apache/certbot_apache/tests/apache-conf-files/apache-conf-test --debian-modules
 
-
 [testenv:le_auto]
 # At the moment, this tests under Python 2.7 only, as only that version is
 # readily available on the Trusty Docker image.
@@ -89,3 +88,21 @@ commands =
 whitelist_externals =
     docker
 passenv = DOCKER_*
+
+[testenv:apache_compat]
+commands =
+    docker build -t certbot-compatibility-test -f certbot-compatibility-test/Dockerfile .
+    docker build -t apache-compat -f certbot-compatibility-test/Dockerfile-apache .
+    docker run --rm -it apache-compat -c apache.tar.gz -vvvv
+whitelist_externals =
+    docker
+passenv = DOCKER_*
+
+[testenv:nginx_compat]
+commands =
+    docker build -t certbot-compatibility-test -f certbot-compatibility-test/Dockerfile .
+    docker build -t nginx-compat -f certbot-compatibility-test/Dockerfile-nginx .
+    docker run --rm -it nginx-compat -c nginx.tar.gz -vvvv
+whitelist_externals =
+    docker
+passenv = DOCKER_*