Fix workflow

CI Actions are now triggered two times for some PRs,
once due "pull request" and once due "push".

Limit "push" trigger to two notable branches only.

.github/workflows/early-access.yaml

@@ -18,7 +18,12 @@
 name: Early Access
 
 # trigger on push to branches and PR
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+      - mvnd-1.x
+  pull_request:
 
 env:
   JAVA_VERSION: '17'