Skip checking a github action step if its not an array as its possibly a templated string.
In gh actions a valid config is ${{ toJSON(steps) }} which breaks the plugins parsing. if we see a string we should just skip those steps

close #492

Adding Support for using with arch machines

close issue #432

• use snowpack build --watch rather then snowpack dev
• Update docs/developments.md to reflect the acutal development
  environment

closses #428

issue #375: Build multiple versions of docker containers for different platforms

See #379 for reference