[ci] Pinning integration tests

This commit pins the integration tests. This is done in the .integration.nix
file, which in turns uses the derivations from the 'argotest'
repository. These pin argopkgs - which itself pins nixpkgs, so
everything should be completely reproducible.

The integration target provisions the dependencies using nix-shell and
runs the basic 'hello world' container test.

.gitignore

@@ -47,5 +47,5 @@ venv/
 *.nav
 *.out
 
-# frequent clones
-argotest
+# integration tests
+_output

.gitlab-ci.yml

@@ -23,21 +23,19 @@ flake8:
     - /^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 ../.
+    - nix-shell .integration.nix --run "argotk.hs helloworld"
   artifacts:
     paths:
-      - argotest/cmd_err.log
-      - argotest/cmd_out.log
-      - argotest/daemon_out.log
-      - argotest/daemon_out.log
-      - argotest/nrm.log
-      - argotest/time.log
+      - _output/cmd_err.log
+      - _output/cmd_out.log
+      - _output/daemon_out.log
+      - _output/daemon_out.log
+      - _output/nrm.log
+      - _output/time.log
+      - _output/.argo_nodeos_config_exit_message
     expire_in: 1 week
   except:
     - /^wip\/.*/

.integration.nix

+{ argotest ? (builtins.fetchGit {
+    url = https://xgitlab.cels.anl.gov/argo/argotest.git;
+    ref="refactor-argotk";
+    rev="a20358e5b72f267eb8e2a9152e62c9ebbb3b2d4a"; })
+}:
+(import argotest {
+  nrm-src = ./.;
+}).test