add back setting pgedge.env file

Author: mason-sharp

.github/workflows/spockbench.yml

@@ -58,6 +58,7 @@ jobs:
       - name: Start docker
         run: |
           cd ${GITHUB_WORKSPACE}/tests/
+          echo PG_VER=${{ matrix.pgver }} >> pgedge.env
           docker compose up
 
       - name: Check spockbench output