Test that we pull in env host variables

Now that clear env variables specified on the command line we can check
that values specified as `${VAR}` are pulled in from the host.

test/integration/docker/deployer/app/config/deploy.yml

@@ -5,7 +5,8 @@ servers:
   - vm2
 env:
   clear:
-    CLEAR_TOKEN: '4321'
+    CLEAR_TOKEN: 4321
+    HOST_TOKEN: "${HOST_TOKEN}"
   secret:
     - SECRET_TOKEN
 asset_path: /usr/share/nginx/html/versions

test/integration/docker/vm/Dockerfile

@@ -7,6 +7,8 @@ RUN apt-get update --fix-missing && apt-get -y install openssh-client openssh-se
 RUN mkdir /root/.ssh && ln -s /shared/ssh/id_rsa.pub /root/.ssh/authorized_keys
 RUN mkdir -p /etc/docker/certs.d/registry:4443 && ln -s /shared/certs/domain.crt /etc/docker/certs.d/registry:4443/ca.crt
 
+RUN echo "HOST_TOKEN=abcd" >> /etc/environment
+
 COPY boot.sh .
 
 HEALTHCHECK --interval=1s CMD pgrep dockerd

test/integration/main_test.rb

@@ -15,6 +15,7 @@ class MainTest < IntegrationTest
     assert_app_is_up version: first_version
     assert_hooks_ran "pre-connect", "pre-build", "pre-deploy", "post-deploy"
     assert_env :CLEAR_TOKEN, "4321", version: first_version
+    assert_env :HOST_TOKEN, "abcd", version: first_version
     assert_env :SECRET_TOKEN, "1234", version: first_version
 
     second_version = update_app_rev