feat(users/flokli/kb/corneish_zen): init

This builds the keyboard firmware using zmk-nix.

The miryoku_zmk config is pulled in from manna-harbour/miryoku_zmk, but
slightly patched to add support for RALT and quick-tap.

Change-Id: I91efbbd789526cce7f086f367c7bccb7857b06e6
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12695
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Autosubmit: flokli <flokli@flokli.de>

users/flokli/keyboards/corneish_zen/west.yml

@@ -0,0 +1,34 @@
+manifest:
+  remotes:
+    - name: zmkfirmware
+      url-base: https://github.com/zmkfirmware
+  projects:
+    - name: zephyr
+      remote: zmkfirmware
+      revision: f8e4d15791602c67405c0fd2651167a895939565  # v3.5.0+zmk-fixes
+      import:
+        name-blocklist:
+          - ci-tools
+          - hal_altera
+          - hal_cypress
+          - hal_infineon
+          - hal_microchip
+          - hal_nxp
+          - hal_openisa
+          - hal_silabs
+          - hal_xtensa
+          - hal_st
+          - hal_ti
+          - loramac-node
+          - mcuboot
+          - mcumgr
+          - net-tools
+          - openthread
+          - edtt
+          - trusted-firmware-m
+    - name: zmk
+      remote: zmkfirmware
+      revision: 7f1ee320ab638245bbdae9b1cda5d5c50e2cb16e  # main
+      import: app/west.yml
+  self:
+    path: config