Disable pytest for this repo

For some reason, on travis, three "tests" are failing:

```
data_providers (unittest.loader._FailedTest) ... ERROR
omero_filters (unittest.loader._FailedTest) ... ERROR
data_providers (unittest.loader._FailedTest) ... ERROR
```

but not locally. For the moment, disabling pytest. When/if
a `test/` directory is created, the script will fail.

.omeroci/app-build

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+source /infra/utils
+
+set -e
+set -u
+set -x
+
+cd $TARGET
+DIR=$(setup_dir)
+
+export DJANGO_SETTINGS_MODULE=omeroweb.settings
+export OMERODIR=/opt/omero/web/OMERO.web
+export ICE_CONFIG=${OMERO_DIST}/etc/ice.config
+
+if [ -e test ]; then
+   echo Tests currently disabled
+   exit 1
+fi