Add task that echos a var

Signed-off-by: Taylor Silva <taylorsilva@outlook.com>

tasks/print-var.yml

@@ -0,0 +1,12 @@
+platform: linux
+
+image_resource:
+  type: mock
+  source: { mirror_self: true }
+
+params:
+  ECHO_ME: "default text to echo from task config file"
+
+run:
+  path: echo
+  args: ["Echo var: ${ECHO_ME}"]