* Fetch configuration content from PR ref
Fixes#6
When fetching the configuration content from the file specified by
`configuration-path`, we should load the content from the ref of the PR.
By default, `repos.getContents` will [use the repository's default
branch][1] if no `ref` is specified.
When first configuring this action, assuming the configuration file is
added in the same PR as the action, the configuration file will not
exist on the default branch. This causes an `HttpError: Not Found` to
occur when attempting to load the configuration from the default branch.
This commit updates the call to `getContents` to add the `ref`
parameter, set to the `GITHUB_SHA` value from the context. This will
cause the action to load the contents of the configuration file from the
ref of the PR, rather than the default branch.
---
This PR also updates the packages to use version 1.0.0 of all the
toolkit action packages, as they were using local files before.
I noticed that `src/main.ts` is not formatted according to the prettier
rules. I'm happy to open another PR that applies prettier to the current
source. I had to disable prettier during implementation of this commit
in order to keep the changes relevant to this PR.
[1]: https://developer.github.com/v3/repos/contents/#get-contents
* Remove exec, io, tool-cache
