chore: set environment variable for public base URL in build workflow

Author: LuggaPugga

.github/workflows/build.yml

@@ -2,6 +2,9 @@ name: Build Test
 
 on: [pull_request, push]
 
+env: 
+  NEXT_PUBLIC_BASE_URL: https://thenextlvl.net
+
 jobs:
   build-and-start:
     runs-on: ubuntu-latest