Add CI tests using the Standard Test Interface

Signed-off-by: Jan Friesse <jfriesse@redhat.com>

tests/.gitignore

@@ -0,0 +1,3 @@
+# Ignore tests runs/artefacts.
+artifacts/**
+**/*.retry

tests/tests.yml

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+- hosts: localhost
+  roles:
+  - role: standard-test-basic
+    tags:
+    - classic
+    tests:
+    - upstream
+    required_packages:
+    - booth-test

tests/upstream/runtest.sh

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+#!/bin/bash
+
+set -xe
+set -o pipefail
+
+/usr/share/booth/tests/test/runtests.py --allow-root-user