added download for calchat in devops

src/routes/devops/+page.svelte

@@ -1 +1,26 @@
-<h1 class="text-4xl font-bold">This is where CalDav builds will be downloadable from</h1>
+<script lang="ts">
+  async function downloadAPK() {
+    try {
+      const response = await fetch("https://pub-7bffd5f7a2874c54bc70ce78955004de.r2.dev/calchat.apk");
+      const blob = await response.blob();
+      const objectUrl = URL.createObjectURL(blob);
+
+      const a = document.createElement("a");
+      a.style.display = "none";
+      a.href = objectUrl;
+      a.download = "calchat.apk";
+
+      document.body.appendChild(a);
+      a.click();
+
+      document.body.removeChild(a);
+      URL.revokeObjectURL(objectUrl);
+    } catch (error) {
+      console.error(`coudn't download calchat apk: ${error}`);
+    }
+  }
+</script>
+
+<h1 class="text-4xl font-bold">This is where CalChat builds can be downloaded from.</h1>
+<h3 class="text-xl font-bold">Currently only available for Android arm64</h3>
+<button on:click={downloadAPK}>Download APK here!</button>