Add a basic unit-test runner

Let's start with something simple to test things out.

.fmf/version

@@ -0,0 +1 @@
+1

build/unit-tests/main.fmf

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+summary: Concise summary describing what the test does
+test: ./test.sh
+require:
+    - perl-IPC-SysV
+    - perl-Time-HiRes
+    - systemd-tests

build/unit-tests/test.sh

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+#!/bin/bash
+
+set -eux
+set -o pipefail
+
+if ! rpm -q systemd-tests; then
+    echo >&2 "Missing package 'systemd-tests'"
+    exit 1
+fi
+
+/usr/lib/systemd/tests/run-unit-tests.py --unsafe

plans/ci.fmf

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+# vi: sw=2 ts=2 et ft=yaml:
+
+summary: systemd Fedora test suite
+discover:
+  how: fmf
+prepare:
+  - name: systemd
+    how: install
+    exclude:
+      - systemd-standalone-tmpfiles
+      - systemd-standalone-sysusers
+execute:
+  how: tmt