added doc for tests

tests/dry-run/README.md

@@ -6,3 +6,29 @@ The CI can perform two types of dry-run:
 2. DEV dry-run, to check the consistency of the devices: e.g., missing parameters, deprecated devices...
 
 The output of the dry-run is stored as artifact within the CI workflow to enable later inspection.
+
+### Invoking `ctest`
+
+#### List available tests
+```console
+ctest -N
+```
+
+#### Run specific tests
+```console
+ctest -R test_name
+ctest -R "test.*"
+```
+
+#### Run tests associated to specific labels
+```console
+ctest -L "label_1;label_2"
+```
+
+#### Run all available tests
+```console
+ctest
+```
+
+### Tests skipped
+Tests that have to be excluded are listed in `skip_tests.txt` file.