MAINT: add safety check for integration tests

The integration tests delete all data in a CaosDB server. This is now displayed again in a question before starting the tests.

.docker/Dockerfile

@@ -31,4 +31,4 @@ RUN rm -r /git/.git \
     && mv /git/.docker/pycaosdb.ini /git/integrationtests
 RUN cd /git && pip3 install .[h5-crawler]
 WORKDIR /git/integrationtests
-CMD /wait-for-it.sh caosdb-server:10443 -t 500 -- ./test.sh
+CMD /wait-for-it.sh caosdb-server:10443 -t 500 -- ./test.sh --force

integrationtests/test.sh

 #!/bin/bash
+if [ "$1" != "--force" ]
+then
+    echo "Warning: For these tests, the whole database will be deleted. Do you want to proceed? (yes/Exit)"
+    read safety
+    if [ -z $safety ]
+    then
+        echo "Exiting..."
+        exit 0
+    elif [ $safety != "yes" ]
+    then
+        echo "Exiting..."
+        exit 0
+    fi
+fi
 OUT=/tmp/crawler.output
 ls 
 cat pycaosdb.ini