Add shell script to build firmware

build_zmk.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+zmk_repo=$1
+output_dir=$2
+boards=("${@:3}")
+
+container_info=$(devcontainer up --workspace-folder $zmk_repo)
+container_id=$(echo $container_info | jq -r '.containerId')
+
+for board in "${boards[@]}"; do
+    echo "Building ZMK firmware for $board"
+    docker exec -w /workspaces/zmk/app $container_id bash -c "west build -p -b $board -- -DZMK_CONFIG=\"/workspaces/zmk-config/config\""
+    docker cp $container_id:/workspaces/zmk/app/build/zephyr/zmk.uf2 $output_dir/$board.uf2
+done