[feature] Added integration tests

Added integration tests to the `.gitlab-ci.yaml` file. These tests
run any runner tagged "integration". They depend on the 'argotest'
repository master branch being able to run the tests, which
uses 'argopkgs' repository. The runner must be Nix
enabled. This therefore currently uses a rolling release of the
integration tests.

.gitignore

@@ -46,3 +46,6 @@ venv/
 *.log
 *.nav
 *.out
+
+# frequent clones
+argotest

.gitlab-ci.yml

@@ -22,3 +22,25 @@ flake8:
   except:
     - /^wip\/.*/
     - /^WIP\/.*/
+
+
+integration.test:
+  stage: test
+  script:
+    - git clone https://xgitlab.cels.anl.gov/argo/argotest.git
+    - cd argotest
+    - nix-shell -A test --run "./argotk.hs helloworld" --arg nrm-src ../.
+  artifacts:
+    paths:
+      - argotest/cmd_err.log
+      - argotest/cmd_out.log
+      - argotest/daemon_out.log
+      - argotest/daemon_out.log
+      - argotest/nrm.log
+      - argotest/time.log
+    expire_in: 1 week
+  except:
+    - /^wip\/.*/
+    - /^WIP\/.*/
+  tags:
+    - integration