Set PostgreSQL environment variables at job level

Moved PGHOST, PGPORT, PGDATABASE, PGUSER, PGPASSWORD environment variables from individual steps to the job level to avoid duplication and make the workflow cleaner.

Co-authored-by: wdconinc <4656391+wdconinc@users.noreply.github.com>

Author: Copilot

.github/workflows/build.yml

@@ -23,6 +23,13 @@ jobs:
         os: [ubuntu-latest] # TODO re-enable: , macos-latest]
         python-version: ['3.10', '3.11', '3.12', '3.13']
 
+    env:
+      PGHOST: localhost
+      PGPORT: 5432
+      PGDATABASE: test
+      PGUSER: test
+      PGPASSWORD: test
+
     services:
       postgres:
         image: postgres:16
@@ -138,11 +145,6 @@ jobs:
       env:
         CC: ${{ runner.os == 'Linux' && 'gcc-14' || 'gcc' }}
         CXX: ${{ runner.os == 'Linux' && 'g++-14' || 'g++' }}
-        PGHOST: localhost
-        PGPORT: 5432
-        PGDATABASE: test
-        PGUSER: test
-        PGPASSWORD: test
     - name: Build and install Python package
       run: |
         pip install . --verbose
@@ -153,9 +155,3 @@ jobs:
     - name: Run Python tests
       run: |
         pytest tests/python/ -v
-      env:
-        PGHOST: localhost
-        PGPORT: 5432
-        PGDATABASE: test
-        PGUSER: test
-        PGPASSWORD: test