Add complete publish automation.

Uses AppSettings to allow for secret storage.

osu.Desktop.Deploy/GitHubRelease.cs

@@ -0,0 +1,25 @@
+using Newtonsoft.Json;
+
+namespace osu.Desktop.Deploy
+{
+    internal class GitHubRelease
+    {
+        [JsonProperty(@"id")]
+        public int Id;
+
+        [JsonProperty(@"tag_name")]
+        public string TagName => $"v{Name}";
+
+        [JsonProperty(@"name")]
+        public string Name;
+
+        [JsonProperty(@"draft")]
+        public bool Draft;
+
+        [JsonProperty(@"prerelease")]
+        public bool PreRelease;
+
+        [JsonProperty(@"upload_url")]
+        public string UploadUrl;
+    }
+}