SQSCANGHA-92 Validate scanner version (#189)

Co-authored-by: Julien HENRY <julien.henry@sonarsource.com>

scripts/sanity-checks.sh

@@ -2,6 +2,11 @@
 
 set -eo pipefail
 
+if [[ ! "${INPUT_SCANNERVERSION}" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+  echo "::error title=SonarScanner::Invalid scannerVersion format. Expected format: x.y.z.w (e.g., 7.1.0.4889)"
+  exit 1
+fi
+
 if [[ -z "${SONAR_TOKEN}" ]]; then
   echo "::warning title=SonarScanner::Running this GitHub Action without SONAR_TOKEN is not recommended"
 fi