Bump cachix/install-nix-action from 15 to 18 (#7439)
Bump cachix/install-nix-action from 15 to 18 (#7439)

Bumps
[cachix/install-nix-action](https://github.com/cachix/install-nix-action)
from 15 to 18.
<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>install-nix-action-v18</h2>
<ul>
<li>Fix nodejs warnings &amp; simplify maintenance</li>
<li>Use python3 when determining number of cores</li>
<li>Collapse installer log messages</li>
</ul>
<h2>install-nix-action-v17</h2>
<ul>
<li>curl for downloading the installer is now in quiet mode (since all
the bugs have been addressed)</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/3acf7e1fab3202b53a8cab01fe0dc90df51df120">ensure
user profile comes before default profile in PATH</a></li>
<li>support <a
href="https://github.com/actions-runner-controller/actions-runner-controller">https://github.com/actions-runner-controller/actions-runner-controller</a>
by using sudo in more places</li>
</ul>
<h2>install-nix-action-v16</h2>
<p>The last release didn't fix <a
href="https://github.com/nektos/act">https://github.com/nektos/act</a>
correctly.</p>
<p>This release corrects that and adds a test (you need act from master
branch).</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/cachix/install-nix-action/commit/daddc62a2e67d1decb56e028c9fa68344b9b7c2a"><code>daddc62</code></a>
Merge pull request <a
href="https://github-redirect.dependabot.com/cachix/install-nix-action/issues/144">#144</a>
from cachix/fix-ci</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/8500bf7aa612aa05660b9a22636a967be2dfd1e1"><code>8500bf7</code></a>
try to fix act test</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/4024cf0f9d12c1dfdfa2caaa36372ca347dcec12"><code>4024cf0</code></a>
Merge pull request <a
href="https://github-redirect.dependabot.com/cachix/install-nix-action/issues/143">#143</a>
from ggreif/patch-1</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/3d1155ed72c1fba9d1fa6c46a48ce24218848a4b"><code>3d1155e</code></a>
readme: don't perpetuate old versions</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/e17a164a729f3f908f3997516f02ecaba2b9c201"><code>e17a164</code></a>
fix <a
href="https://github-redirect.dependabot.com/cachix/install-nix-action/issues/140">#140</a>:
python -&gt; python3</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/92d36226ca2887d9bfe391bf2d00894d88be3b64"><code>92d3622</code></a>
Merge pull request <a
href="https://github-redirect.dependabot.com/cachix/install-nix-action/issues/139">#139</a>
from sigprof/collapse-log-output</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/6c5ba55bfdc791cfad61ac72e473340c1c3ac992"><code>6c5ba55</code></a>
install-nix.sh: Collapse log messages</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/451e61183802597c1febd6ca3cf18aa163f93a06"><code>451e611</code></a>
Merge pull request <a
href="https://github-redirect.dependabot.com/cachix/install-nix-action/issues/134">#134</a>
from lovesegfault/composite-action</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/112054fda702ffd8ef0ac620851b57c3c8e36679"><code>112054f</code></a>
refactor: replace with a simpler composite action</li>
<li><a
href="https://github.com/cachix/install-nix-action/commit/24e801e9d3efe6bac52e0fd3f09d2ab8a815c55f"><code>24e801e</code></a>
Merge pull request <a
href="https://github-redirect.dependabot.com/cachix/install-nix-action/issues/123">#123</a>
from cachix/dependabot/github_actions/actions/setup-go-3</li>
<li>Additional commits viewable in <a
href="https://github.com/cachix/install-nix-action/compare/v15...v18">compare
view</a></li>
</ul>
</details>
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