Add a GitHub Action for a container image build

.dockerignore

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+.github
+.travis.yml
+Dockerfile

.github/workflows/image-build.yml

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+name: image build
+
+on:
+  push:
+    branches:
+      - "master"
+    paths-ignore:
+      - 'README.md'
+      - 'LICENSE.md'
+  release:
+    types: [published]
+
+env:
+  REGISTRY: ghcr.io
+  REGISTRY_IMAGE: ghcr.io/jelmert/cc2538-bsl
+
+# permissions are needed if pushing to ghcr.io
+permissions:
+  packages: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        platform:
+          - linux/amd64
+          - linux/arm/v6
+          - linux/arm/v7
+          - linux/arm64
+          - linux/i386
+    steps:
+      -
+        name: Prepare
+        run: |
+          platform=${{ matrix.platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
+      -
+        name: Checkout
+        uses: actions/checkout@v4
+      -
+        name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY_IMAGE }}
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+        if: matrix.platform != 'linux/amd64'
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      -
+        name: Login to Image Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      -
+        name: Build and push by digest
+        id: build
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          platforms: ${{ matrix.platform }}
+          labels: ${{ steps.meta.outputs.labels }}
+          outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true
+      -
+        name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+      -
+        name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ env.PLATFORM_PAIR }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    runs-on: ubuntu-latest
+    needs:
+      - build
+    steps:
+      -
+        name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      -
+        name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY_IMAGE }}
+      -
+        name: Login to Image registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      -
+        name: Create manifest list and push
+        working-directory: /tmp/digests
+        run: |
+          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *)
+      -
+        name: Inspect image
+        run: |
+          docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ steps.meta.outputs.version }}

Dockerfile

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+FROM python:3-alpine
+ARG REPO_URL='.[cc2538-bsl,intelhex]'
+ADD . /tmp/build/
+RUN cd /tmp/build && \
+    apk add --no-cache file git && \
+    export PIP_ROOT_USER_ACTION=ignore && \
+    pip3 install "${REPO_URL}" && \
+    pip3 uninstall -y setuptools wheel pip && \
+    apk del --no-cache -r git && \
+    rm -r /root/.cache /tmp/build
+RUN adduser -D user && addgroup user dialout
+USER user
+ADD run /usr/local/bin/
+WORKDIR /tmp
+ENTRYPOINT ["run"]

run

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+#!/bin/sh
+set -eu
+[ -z "${TRACE-}" ] || set -x
+
+log() {
+  echo >&2 "${@}"
+}
+
+error() {
+  log "ERROR: ${@}"
+  return 1
+}
+
+prepare_firmware() {
+  set -eu
+  file="${1}"
+  if [ ! -r "${file}" ]; then
+    error "Unreadable firmware file '${file}'"
+  elif file -b "${file}" | grep -qi ^zip; then
+    unzip "${file}" | sed -nE 's/  inflating: (.+)/\1/p'
+  else
+    echo "${file}"
+  fi
+}
+
+run() {
+  local source="${1}" file
+  shift
+  if [ -n "${source}" ]; then
+    file="$(prepare_firmware "${source}")"
+    [ "${file}" = "${source}" ] || log "Firmware source: '${source}'"
+    if [ -z "${file}" ]; then
+      error "Firmware source does not contain a firmware file."
+    elif [ "$(echo "${file}" | wc -l)" -gt 1 ]; then
+      error "Expected exactly 1 firmware file, but found: $(echo "${file}" | xargs)"
+    else
+      log "Firmware file:   '${file}'"
+      set -- "${@}" "${file}"
+    fi
+  fi
+  cc2538-bsl.py "${@}"
+}
+
+main() {
+  local source
+  if [ -n "${FIRMWARE_FILE-}" ]; then
+    source="${FIRMWARE_FILE}"
+  elif [ -n "${FIRMWARE_URL-}" ]; then
+    log "Downloading firmware from ${FIRMWARE_URL}"
+    source="$(wget "${FIRMWARE_URL}" 2>&1 | sed -nE "s/^'(.+)' saved$/\1/p")"
+    [ -n "${source}" ] || error "Download of firmware was not successful."
+  else
+    log "WARNING: neither FIRMWARE_URL nor FIRMWARE_FILE is set as environment variable."
+  fi
+  run "${source-}" "${@}"
+}
+
+main "${@}"