bump cachix/install-nix-action from 20 to 30 (#378)

Bumps
[cachix/install-nix-action](https://github.com/cachix/install-nix-action)
from 20 to 30.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/cachix/install-nix-action/releases">cachix/install-nix-action's
releases</a>.</em></p>
<blockquote>
<h2>v30</h2>
<ul>
<li>Nix: 2.24.7 -&gt; 2.24.9, fixing <a
href="https://github.com/NixOS/nix/security/advisories/GHSA-6fjr-mq49-mm2c">GHSA-6fjr-mq49-mm2c</a></li>
</ul>
<h2>v29</h2>
<p>Bumps Nix to <a
href="https://nix.dev/manual/nix/2.24/release-notes/rl-2.24">2.24.7</a></p>
<h2>v28</h2>
<p>Nix 2.24.6 - <a
href="https://github.com/NixOS/nix/security/advisories/GHSA-h4vv-h3jq-v493">https://github.com/NixOS/nix/security/advisories/GHSA-h4vv-h3jq-v493</a></p>
<h2>v27</h2>
<h2>What's Changed</h2>
<ul>
<li>Enable <code>always-allow-substitutes</code> by default by <a
href="https://github.com/sandydoo"><code>@​sandydoo</code></a> in <a
href="https://redirect.github.com/cachix/install-nix-action/pull/207">cachix/install-nix-action#207</a></li>
<li>nix: 2.20.5 -&gt; 2.22.1 by <a
href="https://github.com/kashw2"><code>@​kashw2</code></a> in <a
href="https://redirect.github.com/cachix/install-nix-action/pull/206">cachix/install-nix-action#206</a></li>
<li>ci: fix tests by <a
href="https://github.com/sandydoo"><code>@​sandydoo</code></a> in <a
href="https://redirect.github.com/cachix/install-nix-action/pull/208">cachix/install-nix-action#208</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/kashw2"><code>@​kashw2</code></a> made
their first contribution in <a
href="https://redirect.github.com/cachix/install-nix-action/pull/206">cachix/install-nix-action#206</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/cachix/install-nix-action/compare/v26...V27">https://github.com/cachix/install-nix-action/compare/v26...V27</a></p>
<h2>v26</h2>
<p>Bump to Nix 2.20.5 to address CVE-2024-27297 /
GHSA-2ffj-w4mj-pg37.</p>
<h2>install-nix-action-v25</h2>
<p>Nix 2.19.2</p>
<h2>install-nix-action-v24</h2>
<ul>
<li>Nix 2.19.1</li>
<li>enables KVM on linux</li>
<li>set <code>TMPDIR</code> to avoid potential disk space issues</li>
<li>don't use the default GitHub token for Enterprise</li>
</ul>
<h2>install-nix-action-v23</h2>
<ul>
<li>always show Nix trace</li>
<li>Nix 2.17</li>
</ul>
<h2>install-nix-action-v22</h2>
<ul>
<li>Nix 2.16.1</li>
<li>Fix issues with System Integrity Protection when using macos-12</li>
</ul>
<h2>install-nix-action-v21</h2>
<ul>
<li>pin Nix to 2.15.1 (recent releases broke too many things)</li>
<li>fix the action to work on custom containers</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="08dcb3a5e6"><code>08dcb3a</code></a>
Merge pull request <a
href="https://redirect.github.com/cachix/install-nix-action/issues/217">#217</a>
from Enzime/bump</li>
<li><a
href="4204e15198"><code>4204e15</code></a>
nix: 2.24.8 -&gt; 2.24.9</li>
<li><a
href="6a10e2e9fd"><code>6a10e2e</code></a>
Merge pull request <a
href="https://redirect.github.com/cachix/install-nix-action/issues/216">#216</a>
from Mic92/nix-bump</li>
<li><a
href="2bb614e91a"><code>2bb614e</code></a>
Nix: 2.24.7 -&gt; 2.24.8</li>
<li><a
href="9f70348d77"><code>9f70348</code></a>
Merge pull request <a
href="https://redirect.github.com/cachix/install-nix-action/issues/215">#215</a>
from Mic92/nix-bump</li>
<li><a
href="4f91dc2b65"><code>4f91dc2</code></a>
Nix: 2.24.6 -&gt; 2.24.7</li>
<li><a
href="3715ab1a11"><code>3715ab1</code></a>
bump channel</li>
<li><a
href="1872f1ff9d"><code>1872f1f</code></a>
Nix: 2.22.1 -&gt; 2.24.6</li>
<li><a
href="e268b7aa05"><code>e268b7a</code></a>
Merge pull request <a
href="https://redirect.github.com/cachix/install-nix-action/issues/213">#213</a>
from phaer/patch-1</li>
<li><a
href="5b8c65d4d7"><code>5b8c65d</code></a>
Update README: hardware accel is available now...</li>
<li>Additional commits viewable in <a
href="https://github.com/cachix/install-nix-action/compare/v20...v30">compare
view</a></li>
</ul>
</details>
<br />


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.github/workflows/demo.yml

@@ -50,7 +50,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install nix
-        uses: cachix/install-nix-action@v20
+        uses: cachix/install-nix-action@v30
 
       - uses: cachix/cachix-action@v14
         with:

.github/workflows/pages.yml

@@ -32,7 +32,7 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Install nix
-        uses: cachix/install-nix-action@v20
+        uses: cachix/install-nix-action@v30
 
       - name: Setup Caching
         uses: cachix/cachix-action@v14