fix: try to use psql from our own corresponding pkg

Author: samrose

.github/workflows/test.yml

@@ -99,8 +99,7 @@ jobs:
           -d supabase/postgres:${{ steps.settings.outputs.postgres-version }}
       - name: Install psql
         run: |
-          sudo apt update
-          sudo apt install -y --no-install-recommends postgresql-client-${{ env.PGMAJOR }}
+          sudo nix profile install .#psql_${{ env.PGMAJOR }}/bin
 
       - name: Install pg_prove
         run: sudo cpan -T TAP::Parser::SourceHandler::pgTAP