fix: set DATABASE_URL at job level for unit tests in PR workflow

prisma.ts throws at import time if DATABASE_URL is not set. The env var
was only set on the 'Generate Prisma client' step, not 'Run unit tests'.

.gitea/workflows/pr.yml

@@ -15,6 +15,8 @@ jobs:
     container:
       image: docker.notsosm.art/euchre-camp/ci-base:latest
       options: --user root
+    env:
+      DATABASE_URL: postgresql://user:pass@localhost:5432/dummy
 
     steps:
       - name: Checkout code
@@ -25,8 +27,6 @@ jobs:
 
       - name: Generate Prisma client
         run: bun x prisma generate
-        env:
-          DATABASE_URL: postgresql://user:pass@localhost:5432/dummy
 
       - name: Run unit tests
         run: bun test src/__tests__/unit/ src/__tests__/*.test.tsx src/__tests__/auth-simple.test.ts