Add local Docker build option

Dockerfile

@@ -0,0 +1,24 @@
+FROM docker.io/zmkfirmware/zmk-build-arm:stable
+
+RUN apt-get update \
+    && apt-get install -y wget \
+    && wget https://github.com/mikefarah/yq/releases/latest/download/yq_linux_amd64 -O /usr/bin/yq \
+    && chmod +x /usr/bin/yq
+
+ARG USER_ID=1000
+
+RUN adduser --disabled-password --gecos '' --uid ${USER_ID} zmk
+
+USER zmk
+
+WORKDIR /app
+
+COPY config/west.yml config/west.yml
+
+RUN west init -l config \
+    && west update \
+    && west zephyr-export
+
+COPY bin/build.sh ./
+
+CMD ["./build.sh"]

Makefile

@@ -0,0 +1,21 @@
+DOCKER := $(shell { command -v podman || command -v docker; })
+
+.PHONY: all clean distclean
+
+all:
+	$(DOCKER) build --tag zmk --build-arg USER_ID=$(shell id -u) .
+	$(DOCKER) volume create build
+	$(DOCKER) run --rm -it --name zmk \
+        -v build:/app \
+        -v $(PWD)/build.yaml:/app/build.yaml:ro \
+		-v $(PWD)/config:/app/config:ro \
+        -v $(PWD)/firmware:/app/firmware \
+        -e OUTPUT_ZMK_CONFIG=$(OUTPUT_ZMK_CONFIG) \
+		zmk
+
+clean:
+	rm -rf firmware/[^.]*
+	-$(DOCKER) volume rm build config firmware
+
+distclean: clean
+	-$(DOCKER) image rm zmk

bin/build.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+
+config_dir="${PWD}/config"
+timestamp=$(date -u +"%Y%m%d%H%M%S")
+
+while IFS=$',' read -r board shield; do
+    extra_cmake_args=${shield:+-DSHIELD="$shield"}
+    artifact_name=${shield:+${shield// /-}-}${board}-zmk
+    filename="firmware/${timestamp}-${artifact_name}"
+    build_dir="build/${artifact_name}"
+
+    echo ""
+    echo "-----------------"
+    echo "BUILDING FIRMWARE"
+    echo "-----------------"
+    echo "Zephyr: ${ZEPHYR_VERSION}"
+    echo "Board: ${board}"
+    echo "Shield: ${shield}"
+    echo ""
+
+    if [[ ! -d "$build_dir" ]]; then
+        west build -s zmk/app -b "$board" -d ${build_dir} -- \
+            -DZMK_CONFIG="$config_dir" "${extra_cmake_args}"
+    else
+        west build -d ${build_dir} -- -DZMK_CONFIG="$config_dir"
+    fi
+
+    if [[ ! -z $OUTPUT_ZMK_CONFIG ]]; then
+        grep -v -e "^#" -e "^$" ${build_dir}/zephyr/.config \
+            | sort > "${filename}.config"
+    fi
+
+    cp ${build_dir}/zephyr/zmk.uf2 "${filename}.uf2"
+done < <(yq '
+    [{"board": .board[], "shield": .shield[] // ""}] + .include
+    | filter(.board)
+    | unique_by(.board + .shield).[]
+    | [.board, .shield // ""]
+    | @csv
+' build.yaml)

firmware/.gitignore

@@ -0,0 +1,2 @@
+*
+!.gitignore