feat: support for using spot instances (#210)

* Update ecmaVersion to 2020

* Run prettier on src

* Add marketType input

* Specify InstanceMarketOptions

* Fix typo

* Generate dist

* Allow specifying market type

Update dist

Update dist

Update dist

Update dist

Add 'pre-runner-script' option (#154)

Add a 'pre-runner-script' option to specify arbitrary bash commands to run
before the runner starts up on the instance.  This is useful if you need
to install dependencies or have OS-specific setup steps.  For example:

      - name: Start EC2 runner
        with:
	 mode: start
	 ec2-image-id: ami-07bdb09c49774f92e
	 pre-runner-script: |
	      sudo yum update -y && \
	      sudo yum install docker git libicu -y \
	      sudo systemctl enable docker

Signed-off-by: Tony Hutter <[email protected]>

Fix deprecation warnings (#123)

* Update node version

* Update version of packages

* Update version of runner

* Update version of actions

* Update dist

Update tag

Update dist

fix: `invalid culture identifier` (#88)

* remove `DOTNET_SYSTEM_GLOBALIZATION_INVARIANT`

* build index.js

Signed-off-by: Alex Chi <[email protected]>