[Keyboard] SharkPCB release Beta compatibility (#16713)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/acheron/shark/alpha/rules.mk

@@ -0,0 +1,26 @@
+# MCU name
+MCU = STM32F303
+BOARD = QMK_PROTON_C
+
+# Bootloader selection
+BOOTLOADER = stm32-dfu
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = yes      # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = yes       # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = yes        # Console for debug
+COMMAND_ENABLE = yes        # Commands for debug and configuration
+NKRO_ENABLE = no            # Enable N-Key Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+AUDIO_ENABLE = no           # Audio output
+
+LAYOUTS = ortho_4x12
+
+# Disable unsupported hardware
+RGBLIGHT_SUPPORTED = no
+AUDIO_SUPPORTED = no
+BACKLIGHT_SUPPORTED = no