ci: run tests as runner user with postgres superuser access

Author: andrielfn

.github/workflows/test.yml

@@ -23,6 +23,11 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y postgresql-${{ matrix.pg-version }} postgresql-server-dev-${{ matrix.pg-version }}
 
+      - name: Start PostgreSQL and configure access
+        run: |
+          sudo systemctl start postgresql
+          sudo -u postgres psql -c "CREATE USER runner SUPERUSER;"
+
       - name: Build extension
         run: |
           export PATH="/usr/lib/postgresql/${{ matrix.pg-version }}/bin:$PATH"
@@ -36,7 +41,4 @@ jobs:
       - name: Run tests
         run: |
           export PATH="/usr/lib/postgresql/${{ matrix.pg-version }}/bin:$PATH"
-          # Allow postgres user to write test results
-          sudo mkdir -p test/results
-          sudo chown -R postgres:postgres test/
-          sudo -u postgres make installcheck || (cat test/results/*.diff 2>/dev/null; exit 1)
+          make installcheck || (cat test/regression.diffs 2>/dev/null; exit 1)