feat(CI/Codestyle): added codestyle check (#3668)

apps/ci/ci-codestyle.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+set -e
+
+echo "Codestyle check script:"
+echo
+
+declare -A singleLineRegexChecks=(
+    ["[[:blank:]]$"]="Remove whitespace at the end of the lines above"
+    ["\t"]="Replace tabs with 4 spaces in the lines above"
+)
+
+for check in ${!singleLineRegexChecks[@]}; do
+    echo "  Checking RegEx: '${check}'"
+    
+    if grep -P -r -I -n ${check} src; then
+        echo
+        echo "${singleLineRegexChecks[$check]}"
+        exit 1
+    fi
+done
+
+echo
+echo "Everything looks good"