fix(ci): Pull SDK from nightly builds.

CMakeLists.txt

@@ -16,8 +16,14 @@ cmake_minimum_required(VERSION 3.20)
 
 cmake_policy(SET CMP0048 NEW)
 
-list(APPEND CMAKE_MODULE_PATH "$ENV{AM_SDK_PATH}/cmake" "${AM_SDK_PATH}/cmake")
-list(APPEND CMAKE_PREFIX_PATH "$ENV{AM_SDK_PATH}/cmake" "${AM_SDK_PATH}/cmake")
+if(EXISTS $ENV{AM_SDK_PATH})
+    string(REPLACE "\\" "/" ENV_AM_SDK_PATH $ENV{AM_SDK_PATH})
+    list(APPEND CMAKE_MODULE_PATH "${ENV_AM_SDK_PATH}/cmake")
+    list(APPEND CMAKE_PREFIX_PATH "${ENV_AM_SDK_PATH}/cmake")
+endif()
+
+list(APPEND CMAKE_MODULE_PATH "${AM_SDK_PATH}/cmake")
+list(APPEND CMAKE_PREFIX_PATH "${AM_SDK_PATH}/cmake")
 
 project(AmplitudeVorbisCodecPlugin)
 
@@ -81,7 +87,11 @@ set(AM_INC_DESTINATION "include")
 
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${AM_LIB_DESTINATION}")
 
-set(CMAKE_INSTALL_PREFIX ${AM_SDK_PATH})
+if(NOT AM_BUILDSYSTEM_BUILDING_AMPLITUDE)
+    set(CMAKE_INSTALL_PREFIX "${CMAKE_CURRENT_LIST_DIR}/sdk")
+else()
+    set(CMAKE_INSTALL_PREFIX ${AM_SDK_PATH})
+endif()
 
 install(
     TARGETS ${PROJECT_NAME}