wip: tekton task to run unit tests

This adds a Task to run pipeline's unit tests

Signed-off-by: Vincent Demeester <vdemeest@redhat.com>

tekton/ci-unit-test-run.yaml

@@ -0,0 +1,25 @@
+apiVersion: tekton.dev/v1alpha1
+kind: PipelineResource
+metadata:
+  name: tekton-pipelines
+spec:
+  type: git
+  params:
+  - name: url
+    value: https://github.com/tektoncd/pipeline # REPLACE with your own fork
+  - name: revision
+    value: master # REPLACE with your own commit
+---
+apiVersion: tekton.dev/v1alpha1
+kind: TaskRun
+metadata:
+  name: unit-tests-run
+spec:
+  taskRef:
+    name: unit-tests
+  inputs:
+    resources:
+    - name: source
+      resourceRef:
+        name: tekton-pipelines
+

tekton/ci-unit-test.yaml

@@ -0,0 +1,26 @@
+apiVersion: tekton.dev/v1alpha1
+kind: Task
+metadata:
+  name: unit-tests
+spec:
+  inputs:
+    params:
+    - name: package
+      description: package (and its children) under test
+      default: github.com/tektoncd/pipeline
+    resources:
+    - name: source
+      type: git
+      targetPath: src/${inputs.params.package}
+  #outputs: # coverage file
+  steps:
+  - name: unit-test
+    image: golang:1.12
+    workingdir: /workspace/src/${inputs.params.package}
+    command:
+    - go 
+    args: ["test", "-v", "-cover", "./..."]
+    env:
+    - name: GOPATH
+      value: /workspace
+