CI: use existing manifest

Modify to use west.yml included in the PR version.
Accordingly, the initialization process has been changed.

Signed-off-by: TOKITA Hiroshi <[email protected]>

Author: soburi

.github/workflows/build.yml

@@ -15,11 +15,12 @@ jobs:
           path: Arduino-Zephyr-API
 
       - name: Initialize
-        working-directory: Arduino-Zephyr-API
         run: |
-          west init -m https://github.com/zephyrproject-rtos/gsoc-2022-arduino-core.git
+          west init -l Arduino-Zephyr-API/
           west update
           git clone https://github.com/arduino/ArduinoCore-API.git ArduinoCore-API
+          mkdir -p modules/lib
+          ln -s Arduino-Zephyr-API modules/lib/
           cp -r ArduinoCore-API/api modules/lib/Arduino-Zephyr-API/cores/arduino/.
 
       - name: Build fade