Update CI to resolve a breaking change in nightly (#25)

* don't run pr's twice in the main repo

* Update CI to resolve a breaking change in nightly

This pr is the same as
twilight-rs/http-proxy#79

Closes #23

Author: Erk-

.github/workflows/ci.yml

@@ -4,6 +4,8 @@ on:
   workflow_dispatch:
   pull_request:
   push:
+    branches:
+      - trunk
 
 jobs:
   check:

.github/workflows/docker.yml

@@ -4,6 +4,8 @@ on:
   workflow_dispatch:
   pull_request:
   push:
+    branches:
+      - trunk
 
 jobs:
   build-images: