Initial exploration of GH actions.

.github/actions/west/Dockerfile

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+FROM debian:stable-slim
+
+RUN apt-get -y update && \
+	apt-get -y upgrade && \
+	apt-get install --no-install-recommends -y \
+	wget \
+	ca-certificates \
+	autoconf \
+	automake \
+	build-essential \
+	ccache \
+	device-tree-compiler \
+	dfu-util \
+	file \
+	g++ \
+	gcc \
+	gcc-multilib \
+	git \
+	iproute2 \
+	libpcap-dev \
+	libtool \
+	make \
+	ninja-build \
+	python3-dev \
+	python3-pip \
+	python3-setuptools \
+	xz-utils && \
+	rm -rf /var/lib/apt/lists/*
+
+ARG ZSDK_VERSION=0.11.2
+RUN wget -q "https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v${ZSDK_VERSION}/zephyr-toolchain-arm-${ZSDK_VERSION}-setup.run" && \
+	sh "zephyr-toolchain-arm-${ZSDK_VERSION}-setup.run" --quiet -- -d /opt/toolchains/zephyr-sdk-${ZSDK_VERSION} && \
+	rm "zephyr-toolchain-arm-${ZSDK_VERSION}-setup.run"
+
+ARG CMAKE_VERSION=3.16.2
+RUN wget -q https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/cmake-${CMAKE_VERSION}-Linux-x86_64.sh && \
+	chmod +x cmake-${CMAKE_VERSION}-Linux-x86_64.sh && \
+	./cmake-${CMAKE_VERSION}-Linux-x86_64.sh --skip-license --prefix=/usr/local && \
+	rm -f ./cmake-${CMAKE_VERSION}-Linux-x86_64.sh
+
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN wget -q https://raw.githubusercontent.com/zephyrproject-rtos/zephyr/master/scripts/requirements.txt && \
+	wget -q https://raw.githubusercontent.com/zephyrproject-rtos/zephyr/master/scripts/requirements-base.txt && \
+	wget -q https://raw.githubusercontent.com/zephyrproject-rtos/zephyr/master/scripts/requirements-build-test.txt && \
+	wget -q https://raw.githubusercontent.com/zephyrproject-rtos/zephyr/master/scripts/requirements-doc.txt && \
+	wget -q https://raw.githubusercontent.com/zephyrproject-rtos/zephyr/master/scripts/requirements-run-test.txt && \
+	wget -q https://raw.githubusercontent.com/zephyrproject-rtos/zephyr/master/scripts/requirements-extras.txt && \
+	pip3 install wheel && \
+	pip3 install -r requirements.txt && \
+	pip3 install west && \
+	pip3 install sh
+
+ENV ZEPHYR_TOOLCHAIN_VARIANT=zephyr
+ENV ZEPHYR_SDK_INSTALL_DIR=/opt/toolchains/zephyr-sdk-${ZSDK_VERSION}
+
+ENTRYPOINT ["west"]

.github/actions/west/action.yml

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+name: "Zephyr West"
+description: 'Action incorporating Zephyr dependencies and West build tool'
+inputs:
+  command:  # id of input
+    description: 'Which west command to execute'
+    required: true
+    default: 'build'
+  command-args:  # id of input
+    description: 'Extra arguments for the west command'
+    required: false
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.command }}
+    - ${{ inputs.command-args }}

.github/workflows/build.yml

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+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: Basic build of the ZMK firmware
+    steps:
+      # To use this repository's private action,
+      # you must check out the repository
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: West Init
+        uses: ./.github/actions/zephyr-west # Uses an action in the root directory
+        id: west-init
+        with:
+          command: 'init'
+          command-args: '-l .'
+      - name: West Update
+        uses: ./.github/actions/zephyr-west # Uses an action in the root directory
+        id: west-update
+        with:
+          command: 'update'
+      - name: West Config Zephyr Base
+        uses: ./.github/actions/zephyr-west # Uses an action in the root directory
+        id: west-config
+        with:
+          command: 'config'
+          command-args: '--global zephyr.base-prefer configfile'
+      - name: West Zephyr Export
+        uses: ./.github/actions/zephyr-west # Uses an action in the root directory
+        id: west-zephyr-export
+        with:
+          command: 'zephyr-export'
+      - name: West Build
+        uses: ./.github/actions/zephyr-west # Uses an action in the root directory
+        id: west-zephyr-export
+        with:
+          command: 'build'
+          command-args: '-b nucleo_wb55rg -- -DSHIELD=petejohanson_handwire'