Refactor test workflow

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

tests/start-up-and-test.sh

@@ -1,11 +1,5 @@
 #!/bin/bash
 
-rm -rf pypicohsm
-git clone https://github.com/polhenarejos/pypicohsm.git
-pip3 install -e pypicohsm
-/usr/sbin/pcscd &
-sleep 2
-rm -f memory.flash
-tar -xf tests/memory.tar.gz
-./build_in_docker/pico_hsm > /dev/null 2>&1 &
+source ./tests/startup.sh
+
 pytest tests -W ignore::DeprecationWarning