Bumps [actions/checkout](https://github.com/actions/checkout) from 2.4.0 to 3.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/actions/checkout/releases">actions/checkout's releases</a>.</em></p>
<blockquote>
<h2>v3.0.0</h2>
<ul>
<li>Update default runtime to node16</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/actions/checkout/blob/main/CHANGELOG.md">actions/checkout's changelog</a>.</em></p>
<blockquote>
<h1>Changelog</h1>
<h2>v2.3.1</h2>
<ul>
<li><a href="https://github-redirect.dependabot.com/actions/checkout/pull/284">Fix default branch resolution for .wiki and when using SSH</a></li>
</ul>
<h2>v2.3.0</h2>
<ul>
<li><a href="https://github-redirect.dependabot.com/actions/checkout/pull/278">Fallback to the default branch</a></li>
</ul>
<h2>v2.2.0</h2>
<ul>
<li><a href="https://github-redirect.dependabot.com/actions/checkout/pull/258">Fetch all history for all tags and branches when fetch-depth=0</a></li>
</ul>
<h2>v2.1.1</h2>
<ul>
<li>Changes to support GHES (<a href="https://github-redirect.dependabot.com/actions/checkout/pull/236">here</a> and <a href="https://github-redirect.dependabot.com/actions/checkout/pull/248">here</a>)</li>
</ul>
<h2>v2.1.0</h2>
<ul>
<li><a href="https://github-redirect.dependabot.com/actions/checkout/pull/191">Group output</a></li>
<li><a href="https://github-redirect.dependabot.com/actions/checkout/pull/199">Changes to support GHES alpha release</a></li>
<li><a href="https://github-redirect.dependabot.com/actions/checkout/pull/184">Persist core.sshCommand for submodules</a></li>
<li><a href="https://github-redirect.dependabot.com/actions/checkout/pull/163">Add support ssh</a></li>
<li><a href="https://github-redirect.dependabot.com/actions/checkout/pull/179">Convert submodule SSH URL to HTTPS, when not using SSH</a></li>
<li><a href="https://github-redirect.dependabot.com/actions/checkout/pull/157">Add submodule support</a></li>
<li><a href="https://github-redirect.dependabot.com/actions/checkout/pull/144">Follow proxy settings</a></li>
<li><a href="https://github-redirect.dependabot.com/actions/checkout/pull/141">Fix ref for pr closed event when a pr is merged</a></li>
<li><a href="https://github-redirect.dependabot.com/actions/checkout/pull/128">Fix issue checking detached when git less than 2.22</a></li>
</ul>
<h2>v2.0.0</h2>
<ul>
<li><a href="https://github-redirect.dependabot.com/actions/checkout/pull/108">Do not pass cred on command line</a></li>
<li><a href="https://github-redirect.dependabot.com/actions/checkout/pull/107">Add input persist-credentials</a></li>
<li><a href="https://github-redirect.dependabot.com/actions/checkout/pull/104">Fallback to REST API to download repo</a></li>
</ul>
<h2>v2 (beta)</h2>
<ul>
<li>Improved fetch performance
<ul>
<li>The default behavior now fetches only the SHA being checked-out</li>
</ul>
</li>
<li>Script authenticated git commands
<ul>
<li>Persists <code>with.token</code> in the local git config</li>
<li>Enables your scripts to run authenticated git commands</li>
<li>Post-job cleanup removes the token</li>
<li>Coming soon: Opt out by setting <code>with.persist-credentials</code> to <code>false</code></li>
</ul>
</li>
<li>Creates a local branch
<ul>
<li>No longer detached HEAD when checking out a branch</li>
<li>A local branch is created with the corresponding upstream branch set</li>
</ul>
</li>
<li>Improved layout</li>
</ul>

</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="a12a3943b4"><code>a12a394</code></a> update readme for v3 (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/708">#708</a>)</li>
<li><a href="8f9e05e482"><code>8f9e05e</code></a> Update to node 16 (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/689">#689</a>)</li>
<li><a href="230611dbd0"><code>230611d</code></a> Change secret name for PAT to not start with GITHUB_ (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/623">#623</a>)</li>
<li>See full diff in <a href="https://github.com/actions/checkout/compare/v2.4.0...v3">compare view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=actions/checkout&package-manager=github_actions&previous-version=2.4.0&new-version=3)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
- `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)


</details>

This pull request aims to make it possible to generate, format, and lint the protos within this repo.
To accomplish that end, the Dockerfile containing common tools for building the tendermint protos has been moved into this repository and several accompanying changes were made to streamline the proto generation process.