[FL-2887] actions unit tests runner (#1920)

Co-authored-by: Konstantin Volkov <k.volkov@flipperdevices.com>
Co-authored-by: あく <alleteam@gmail.com>

scripts/testing/await_flipper.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+
+import sys, os, time
+
+
+def flp_serial_by_name(flp_name):
+    if sys.platform == "darwin":  # MacOS
+        flp_serial = "/dev/cu.usbmodemflip_" + flp_name + "1"
+    elif sys.platform == "linux":  # Linux
+        flp_serial = (
+            "/dev/serial/by-id/usb-Flipper_Devices_Inc._Flipper_"
+            + flp_name
+            + "_flip_"
+            + flp_name
+            + "-if00"
+        )
+
+    if os.path.exists(flp_serial):
+        return flp_serial
+    else:
+        if os.path.exists(flp_name):
+            return flp_name
+        else:
+            return ""
+
+
+UPDATE_TIMEOUT = 30
+
+
+def main():
+    flipper_name = sys.argv[1]
+    elapsed = 0
+    flipper = flp_serial_by_name(flipper_name)
+
+    while flipper == "" and elapsed < UPDATE_TIMEOUT:
+        elapsed += 1
+        time.sleep(1)
+        flipper = flp_serial_by_name(flipper_name)
+
+    if flipper == "":
+        print(f"Cannot find {flipper_name} flipper. Guess your flipper swam away")
+        sys.exit(1)
+
+    sys.exit(0)
+
+
+if __name__ == "__main__":
+    main()