Enable CI tests using the Standard Test Interface

Adding initial set of basic functionality tests for mksh
according to the Standard Test Interface [1]. See Quick Start
Guide [2] for brief introduction about how to run these tests
and the Fedora CI portal [3] for more detailed info and links.

[1] https://fedoraproject.org/wiki/CI/Standard_Test_Interface
[2] https://fedoraproject.org/wiki/CI/Quick_Start_Guide
[3] https://fedoraproject.org/wiki/CI

tests/tests.yml

@@ -0,0 +1,17 @@
+---
+
+- hosts: localhost
+  roles:
+  - role: standard-test-beakerlib
+    tags:
+    - classic
+    repositories:
+    - repo: "https://src.fedoraproject.org/tests/shell.git"
+      dest: "shell"
+      fmf_filter: "tier: 1, 2"
+    environment:
+      PACKAGES: mksh
+      SH_BIN: mksh
+    required_packages:
+    - expect            # login requires expect
+    - which             # smoke requires which