Add script to run integration tests (#1431)

* script run integration tests

* Update scripts/parachains_integration_tests.sh

Co-authored-by: Squirrel <gilescope@gmail.com>

* Update scripts/parachains_integration_tests.sh

Co-authored-by: Chevdor <chevdor@users.noreply.github.com>

* Update scripts/parachains_integration_tests.sh

Co-authored-by: Squirrel <gilescope@gmail.com>
Co-authored-by: Chevdor <chevdor@users.noreply.github.com>

cumulus/scripts/parachains_integration_tests.sh

+#!/usr/bin/env bash
+
+tests=(
+    statemine
+    statemint
+)
+
+rm -R logs &> /dev/null
+
+for t in ${tests[@]}
+do
+    printf "\n🔍  Running $t tests...\n\n"
+
+    mkdir -p logs/$t
+
+    parachains-integration-tests \
+        -m zombienet \
+        -c ./parachains/integration-tests/$t/config.toml \
+        -cl ./logs/$t/chains.log 2> /dev/null &
+
+    parachains-integration-tests \
+        -m test \
+        -t ./parachains/integration-tests/$t \
+        -tl ./logs/$t/tests.log & tests=$!
+
+    wait $tests
+
+    pkill -f polkadot
+    pkill -f parachain
+
+    printf "\n🎉 $t integration tests finished! \n\n"
+done