Fix upload test results for macos regression CI

.github/workflows/linux-build-and-test.yaml

@@ -73,6 +73,7 @@ jobs:
         sudo perl -MCPAN -e "CPAN::Shell->notest('install', 'IPC::Run')"
         sudo perl -MCPAN -e "CPAN::Shell->notest('install', 'Test::Most')"
 
+
     - name: Checkout TimescaleDB
       uses: actions/checkout@v3
 
@@ -282,6 +283,10 @@ jobs:
             GITHUB_PR_NUMBER=0
         fi
         export GITHUB_PR_NUMBER
-        PSQL="${HOME}/${PG_INSTALL_DIR}/bin/psql"
-        export PSQL
+        if [[ "${{ runner.os }}" == "macOS" ]] ;
+        then
+          # Add libpq to PATH so psql can be used for uploading
+          # test results
+          export PATH="/usr/local/opt/libpq/bin:$PATH"
+        fi
         scripts/upload_ci_stats.sh