Introduce a foreign document test docker container.

This test will grab documents from external sources and compare Organic's parser vs the official org-mode parser to ensure they are parsing the same. This is so we do not introduce large irrelevant documents in the git history and so we do not introduce documents with restrictive licenses into the repository.

.lighthouse/pipeline-rust-test.yaml

@@ -83,6 +83,7 @@ spec:
             value: "gcr.io/kaniko-project/executor:v1.12.1"
           - name: EXTRA_ARGS
             value:
+              - --target=tester
               - --cache=true
               - --cache-copy-layers
               - --cache-repo=harbor.fizz.buzz/kanikocache/cache