message: feat(CLI): Add docker pull status information when required
  Closes
diff: @@ -64,6 +64,25 @@ function processCommonOptions() {
  dockerImage = options.image
  }
  + const dockerImageCheck = spawnSync('docker', ['images', '--quiet', dockerImage], {
  + env: process.env,
  + stdio: 'pipe',
  + encoding: 'utf-8',
  + })
  +
  + if (dockerImageCheck.stdout === '') {
  + console.log(`Build environment image not found, pulling ${dockerImage}...`)
  + const dockerPull = spawnSync('docker', ['pull', dockerImage], {
  + env: process.env,
  + stdio: 'inherit',
  + encoding: 'utf-8',
  + })
  + if (dockerPull.status !== 0) {
  + console.error(`Could not pull docker image ${dockerImage}`)
  + process.exit(dockerPull.status)
  + }
  + }
  +
  // Ensure we have the 'dockcross' Docker build environment driver script
  const dockcrossScript = path.join(buildDir, 'itk-wasm-build-env')
  try {
  