add NBL_WITH_DOCKER option

Author: YasInvolved

CMakeLists.txt

@@ -193,6 +193,7 @@ option(NBL_BUILD_BULLET "Enable Bullet Physics building and integration?" OFF)
 option(NBL_BUILD_DOCS "Enable building documentation?" OFF) # No one has doxygen installed, plus we dont know when was the last time we generated working doxy and we'll use SphinX in the future
 option(NBL_ENABLE_PROJECT_JSON_CONFIG_VALIDATION "" ON)
 option(NBL_EMBED_BUILTIN_RESOURCES "Embed built-in resources?" ON)
+option(NBL_WITH_DOCKER "Detects and installs docker if not present in the system" OFF)
 
 set(THIRD_PARTY_SOURCE_DIR "${PROJECT_SOURCE_DIR}/3rdparty")
 set(THIRD_PARTY_BINARY_DIR "${PROJECT_BINARY_DIR}/3rdparty")