fix: Show version number with card loading spinner (#1825)

- Closes #1818

**Why add this?**: A repeated pattern is that an issue is fixed in the
card, a new build is released and users will incorrectly believe it's
not yet fixed due to their browser caching the old code. This results in
wasting their time, and my time.

**But it's obnoxious!**: I'm pretty sensitive to this (hence adding
these messages!), so let me know how terrible you find it. You can
disable it with:

```yaml
performance:
  features:
    card_loading_indicator: false
```

src/components/loading.ts

@@ -1,12 +1,14 @@
 import { CSSResultGroup, LitElement, TemplateResult, html, unsafeCSS } from 'lit';
 import { customElement } from 'lit/decorators.js';
 import loadingStyle from '../scss/loading.scss';
+import { getReleaseVersion } from '../utils/diagnostics';
 import './icon';
 
 @customElement('frigate-card-loading')
 export class FrigateCardLoading extends LitElement {
   protected render(): TemplateResult {
-    return html`<frigate-card-icon .icon=${{ icon: 'iris' }}></frigate-card-icon>`;
+    return html`<frigate-card-icon .icon=${{ icon: 'iris' }}></frigate-card-icon
+      ><span>${getReleaseVersion(true)}</span>`;
   }
 
   static get styles(): CSSResultGroup {