SWPROT-8953: Add recipe to pull UnifySDK dependency

This file is shared a single commit,
to allow pick between projects (eg: z-wave-protocol-controller)
consuming UnifySDK since the monorepo has been shrinked.
Feedback welcome.

Note values can be ajusted from env,
it can be usefull for github actions with fork,
if using private one make sure to pass the token in the build env:

    UNIFYSDK_GIT_REPOSITORY="https://<TOKEN>@github.com/rzr/UnifySDK"

Bug-SiliconLabs: SWPROT-8953
Origin: #51
Forwarded: uic/pull-requests/2972
Forwarded: SiliconLabsSoftware/z-wave-protocol-controller#10
Signed-off-by: Philippe Coval <philippe.coval@silabs.com>

Author: rzr

cmake/modules/FindUnifySDK.cmake

@@ -0,0 +1,48 @@
+# SPDX-FileCopyrightText: Silicon Laboratories Inc. <https://www.silabs.com/>
+# SPDX-License-Identifier: Zlib
+#
+# Origin: https://github.com/SiliconLabs/UnifySDK/pull/51
+#
+# This recipe allows to download Unify Core
+# It can be used by projects which are depending on it
+# Feel free to copy this (up to date) file everywhere it is needed
+
+include(FetchContent)
+
+if(NOT DEFINED UNIFYSDK_GIT_REPOSITORY)
+  if(DEFINED ENV{UNIFYSDK_GIT_REPOSITORY})
+    set(UNIFYSDK_GIT_REPOSITORY $ENV{UNIFYSDK_GIT_REPOSITORY})
+  endif()
+endif()
+if("${UNIFYSDK_GIT_REPOSITORY}" STREQUAL "")
+  set(UNIFYSDK_GIT_REPOSITORY "https://github.com/SiliconLabs/UnifySDK")
+endif()
+
+if(NOT DEFINED UNIFYSDK_GIT_TAG)
+  if(DEFINED ENV{UNIFYSDK_GIT_TAG})
+    set(UNIFYSDK_GIT_TAG $ENV{UNIFYSDK_GIT_TAG})
+  endif()
+endif()
+if("${UNIFYSDK_GIT_TAG}" STREQUAL "")
+  set(UNIFYSDK_GIT_TAG "main") # Override CMake default ("master")
+endif()
+
+FetchContent_Declare(
+  UnifySDK
+  GIT_REPOSITORY ${UNIFYSDK_GIT_REPOSITORY}
+  GIT_TAG        ${UNIFYSDK_GIT_TAG}
+  GIT_SUBMODULES_RECURSE True
+  GIT_SHALLOW 1
+)
+
+message(STATUS "${CMAKE_PROJECT_NAME}: Depends: ${UNIFYSDK_GIT_REPOSITORY}#${UNIFYSDK_GIT_TAG}")
+string(REGEX MATCH ".*/?main/?.*" UNIFYSDK_UNSTABLE_GIT_TAG "${UNIFYSDK_GIT_TAG}")
+if(UNIFYSDK_GIT_TAG STREQUAL "" OR UNIFYSDK_UNSTABLE_GIT_TAG)
+  message(WARNING "${CMAKE_PROJECT_NAME}: Declare UNIFYSDK_GIT_TAG to stable version not: ${UNIFYSDK_UNSTABLE_GIT_TAG}")
+endif()
+
+set(FETCHCONTENT_QUIET FALSE)
+FetchContent_MakeAvailable(UnifySDK)
+
+# message(STATUS "UnifySDK Sources: ${unifysdk_SOURCE_DIR}")
+# message(STATUS "UnifySDK Binaries: ${unifysdk_BINARY_DIR}")