Displayed "View plate" button only if PUBLIC_FRACTAL_VIZARR_VIEWER_URL is set

Author: zonia3000

.github/workflows/end_to_end_tests.yaml

@@ -18,6 +18,7 @@ jobs:
       OAUTH_DEXIDP_REDIRECT_URL: "http://localhost:5173/auth/login/oauth2/"
       OAUTH_DEXIDP_OIDC_CONFIGURATION_ENDPOINT: "http://127.0.0.1:5556/dex/.well-known/openid-configuration"
       PUBLIC_OAUTH_CLIENT_NAME: dexidp
+      PUBLIC_FRACTAL_VIZARR_VIEWER_URL: http://localhost:3000/vizarr
 
     strategy:
       matrix:

src/routes/v2/projects/[projectId]/datasets/[datasetId]/+page.svelte

@@ -499,7 +499,7 @@
 	</div>
 </div>
 
-{#if plates.length > 0}
+{#if vizarrViewerUrl && plates.length > 0}
 	<div class="border border-info rounded bg-light p-3 mt-2">
 		<div class="row mb-2">
 			<div class="col">