Add a 'one-off' task to run single test case on concourse

concourse/tasks/run-manifest-yaml-test.yml

@@ -0,0 +1,27 @@
+#
+# A one-of task you can run on concourse to run a single maven test
+#
+# Run this with the following command from the ROOT of the sts4 repo:
+#
+#  fly -t tools execute -x --config concourse/tasks/run-manifest-yaml-test.yml
+inputs:
+- name: sts4
+platform: linux
+image_resource:
+  type: docker-image
+  source:
+    repository: kdvolder/sts4-build-env
+run:
+  dir: sts4/vscode-extensions/vscode-manifest-yaml
+  path: ../mvnw
+  args: 
+  - "-U"
+  - "-f"
+  - "../pom.xml"
+  - "-pl"
+  - "vscode-manifest-yaml"
+  - "-am"
+  - "-DfailIfNoTests=false"
+  - "-Dtest=ManifestYamlEditorTest#reconcileShowsWarningOnUnknownService"
+  - "clean"
+  - "install"