feat: add the fn to check if the script is already running in a container

This is needed for CI runs, where we do not want container in container

Author: darkdoc

src/internal/embedded/resources/pattern.sh

@@ -9,6 +9,19 @@ function version {
     echo "$1" | awk -F. '{ printf("%d%03d%03d%03d\n", $1,$2,$3,$4); }'
 }
 
+# We need this check mostly for CI testing, we do not want to run container in container
+function is_container() {
+    [ -n "${KUBERNETES_SERVICE_HOST:-}" ] && return 0
+    [ -f /.dockerenv ] && return 0
+    [ -f /run/.containerenv ] && return 0
+    return 1
+}
+
+if is_container; then
+    echo "Already running in a container"
+    exec "$@"
+fi
+
 if [ -z "${PATTERN_UTILITY_CONTAINER:-}" ]; then
 	PATTERN_UTILITY_CONTAINER="quay.io/validatedpatterns/utility-container"
 fi