Merge pull request docker#563 from crazy-max/new-inputs

`build-contexts` input

Merge pull request docker#563 from crazy-max/new-inputs

`build-contexts` input

Merge pull request docker#555 from crazy-max/fix-add-host

Fix add-hosts context

Merge pull request docker#531 from BeyondEvil/subdir-with-default-con…

…text

Add subdirectory for Git context

Merge pull request docker#439 from docker/dependabot/npm_and_yarn/act…

…ions/core-1.5.0

Bump @actions/core from 1.4.0 to 1.5.0

Merge pull request docker#400 from crazy-max/typo

Small typo and ensure trimmed output

Merge pull request docker#399 from crazy-max/sha-version

Handle git sha version of buildx

Merge pull request docker#371 from crazy-max/console-output

Enhance console output

Merge pull request docker#338 from crazy-max/network

Add network input

Merge pull request docker#299 from crazy-max/split-docs

Enhance documentation