add automated tests

t/msc-docker.yaml

@@ -0,0 +1,12 @@
+#
+# this is a mosscap item file, see: https://codeberg.org/scip/mosscap
+items:
+  - name: docker/domdoc
+
+vars:
+  index: test
+  time: 5s
+
+tasks:
+  - name: wait
+    action: docker_wait