feat: Zephyr SDK 0.12.1

See: https://github.com/zephyrproject-rtos/sdk-ng/releases/tag/v0.12.1
PR: zmkfirmware/zmk-docker#77

.github/workflows/containers.yml

@@ -2,7 +2,7 @@ name: Containers
 
 env:
   zephyr-version: 2.4.0
-  zephyr-sdk-version: 0.12.0
+  zephyr-sdk-version: 0.12.1
   sha-abbrev-length: 12
   no-cache: ${{ secrets.NO_CACHE != null || github.event_name == 'workflow_dispatch' || github.event_name == 'schedule' }}
   ignore-actions-cache: ${{ secrets.IGNORE_ACTIONS_CACHE != null }}

README.md

@@ -8,6 +8,7 @@ Lightweight Docker images for [ZMK][zmk].
 #### Not Tested
 - `arc`
 - `arm64`
+- `mips`
 - `nios2`
 - `riscv64`
 - `sparc`

architectures.yml

@@ -1,6 +1,7 @@
 - arc
 - arm
 - arm64
+- mips
 - nios2
 - riscv64
 - sparc