i added tekton task for cleanup and unit test

.tekton/tasks.yml

@@ -0,0 +1,57 @@
+apiVersion: tekton.dev/v1beta1
+kind: Task
+metadata:
+  name: cleanup
+spec:
+  workspaces:
+    - name: source
+  steps:
+    - name: remove
+      image: alpine:3
+      env:
+        - name: WORKSPACE_SOURCE_PATH
+          value: $(workspaces.source.path)
+      workingDir: $(workspaces.source.path)
+      securityContext:
+        runAsNonRoot: false
+        runAsUser: 0
+      script: |
+            #!/usr/bin/env sh
+            set -eu
+            echo "Removing all files from ${WORKSPACE_SOURCE_PATH} ..."
+            # Delete any existing contents of the directory if it exists.
+            #
+            # We don't just "rm -rf ${WORKSPACE_SOURCE_PATH}" because ${WORKSPACE_SOURCE_PATH} might be "/"
+            # or the root of a mounted volume.
+            if [ -d "${WORKSPACE_SOURCE_PATH}" ] ; then
+              # Delete non-hidden files and directories
+              rm -rf "${WORKSPACE_SOURCE_PATH:?}"/*
+              # Delete files and directories starting with . but excluding ..
+              rm -rf "${WORKSPACE_SOURCE_PATH}"/.[!.]*
+              # Delete files and directories starting with .. plus any other character
+              rm -rf "${WORKSPACE_SOURCE_PATH}"/..?*
+            fi
+
+---
+apiVersion: tekton.dev/v1beta1
+kind: Task
+metadata:
+  name: pytest
+spec:
+  workspaces:
+    - name: source
+  params:
+    - name: args
+      description: Arguments to pass to pytest
+      type: string
+      default: ''
+  steps:
+    - name: pytest
+      image: python:3.9-slim
+      workingDir: $(workspaces.source.paths)
+      script: |
+        #!/bin/bash
+        set -e
+        python -m pip install --upgrade pip wheel
+        pip install -r requirements.txt
+        python -m pytest $(params.args)