Specify footer banner text with env var

Author: mvandenburgh

web/README.md

@@ -42,3 +42,6 @@ yarn migrate 0.5.1
 
 - VITE_APP_SERVER_DOWNTIME_MESSAGE
   - A custom error message displayed when the backend server can't be reached.
+
+- VITE_APP_FOOTER_BANNER_TEXT
+  - A custom message to show in an information banner on the DANDI homepage. The banner does not render if this isn't set.

web/src/components/FooterBanner.vue

@@ -1,11 +1,16 @@
 <template>
-  <v-banner color="grey darken-1 text-center">
+  <v-banner color="grey darken-1 text-center" v-if="bannerText">
     <v-icon>
       mdi-information
     </v-icon>
     <span>
-      This repository is under review by NIH for potential modification
-      in compliance with U.S. federal Administration directives.
+      {{ bannerText }}
     </span>
   </v-banner>
 </template>
+
+<script setup lang="ts">
+import { computed } from 'vue';
+
+const bannerText = computed(() => import.meta.env.VITE_APP_FOOTER_BANNER_TEXT);
+</script>