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Include common example for fetching PR base-ref 

Since this seems to be a common scenario and is generating a lot of discussion (#93), it seems worthwhile to add it to the readme as an example.

I placed it before the other fetch examples because this use-case still only fetches minimal history (only adding one additional ref); so it seems helpful to place this above the other fetch examples which all do deeper fetches.
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Jason Karns 2020-04-09 10:11:26 -04:00 committed by GitHub
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@ -112,15 +112,18 @@ Refer [here](https://github.com/actions/checkout/blob/v1/README.md) for previous
- [Checkout a different branch](#Checkout-a-different-branch) - [Checkout a different branch](#Checkout-a-different-branch)
- [Checkout HEAD^](#Checkout-HEAD) - [Checkout HEAD^](#Checkout-HEAD)
- [Checkout multiple repos (side by side)](#Checkout-multiple-repos-side-by-side) - [Checkout multiple repos (side by side)](#Checkout-multiple-repos-side-by-side)
- [Checkout multiple repos (nested)](#Checkout-multiple-repos-nested) - [Checkout multiple repos (nested)](#Checkout-multiple-repos-nested)
- [Checkout multiple repos (private)](#Checkout-multiple-repos-private) - [Checkout multiple repos (private)](#Checkout-multiple-repos-private)
- [Checkout pull request HEAD commit instead of merge commit](#Checkout-pull-request-HEAD-commit-instead-of-merge-commit) - [Checkout pull request HEAD commit instead of merge commit](#Checkout-pull-request-HEAD-commit-instead-of-merge-commit)
- [Checkout pull request on closed event](#Checkout-pull-request-on-closed-event) - [Checkout pull request on closed event](#Checkout-pull-request-on-closed-event)
- [Fetch pull request base-ref in addition to merge commit (for diffing)](#Fetch-pull-request-base-ref-in-addition-to-merge-commit-for-diffing)
- [Fetch all tags](#Fetch-all-tags) - [Fetch all tags](#Fetch-all-tags)
- [Fetch all branches](#Fetch-all-branches) - [Fetch all branches](#Fetch-all-branches)
- [Fetch all history for all tags and branches](#Fetch-all-history-for-all-tags-and-branches) - [Fetch all history for all tags and branches](#Fetch-all-history-for-all-tags-and-branches)
## Checkout a different branch ## Checkout a different branch
```yaml ```yaml
@ -207,6 +210,15 @@ jobs:
- uses: actions/checkout@v2 - uses: actions/checkout@v2
``` ```
## Fetch pull request base-ref in addition to merge commit (for diffing)
```yml
- uses: actions/checkout@v2
- name: Fetch base_ref HEAD
run: git fetch --depth=1 origin +refs/heads/${{github.base_ref}}:refs/remotes/origin/${{github.base_ref}}
- run: git diff origin/${{github.base_ref}}..HEAD
```
## Fetch all tags ## Fetch all tags
```yaml ```yaml