Update main.workflow

Author: twitchax

.github/main.workflow

@@ -7,3 +7,20 @@ action "twitchax/actions/dotnet/cli@master" {
   uses = "twitchax/actions/dotnet/cli@master"
   args = "test"
 }
+
+workflow "Release" {
+  on = "release"
+  resolves = ["nuget-push"]
+}
+
+action "pack" {
+  uses = "twitchax/actions/dotnet/cli@master"
+  args = "pack -c Release"
+}
+
+action "nuget-push" {
+  uses = "twitchax/actions/dotnet/nuget-push@master"
+  needs = ["pack"]
+  args = "**/AspNetCore.Proxy.*.nupkg"
+  secrets = ["NUGET_KEY"]
+}