Fix CI: pass PATH to sudo for cargo pgrx install

sudo --preserve-env=PATH doesn't work reliably; use sudo env "PATH=$PATH".

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: jhf

.github/workflows/regression.yml

@@ -46,7 +46,7 @@ jobs:
           cargo install --locked cargo-pgrx --version 0.16.1
           cargo pgrx init --pg18=${{ env.PG_CONFIG }}
           cd native
-          sudo --preserve-env=PATH cargo pgrx install --release --pg-config=${{ env.PG_CONFIG }}
+          sudo env "PATH=$PATH" cargo pgrx install --release --pg-config=${{ env.PG_CONFIG }}
 
       - name: Run regression tests
         run: make installcheck PG_CONFIG=${{ env.PG_CONFIG }}