fixup! [CI][WIP] Test a homebrew-based CI.

Author: hageboeck

.github/workflows/root-ci.yml

@@ -162,13 +162,18 @@ jobs:
           done
 
       - name: Enter Python venv
+        shell: bash -leo pipefail {0}
         run: |
           if [ -d ${VENV_DIR} ]; then
             source ${VENV_DIR}/bin/activate
-            echo "${PATH}" >> $GITHUB_PATH
+            echo "${VENV_DIR}/bin/" >> "$GITHUB_PATH"
             echo "VIRTUAL_ENV=${VIRTUAL_ENV}" >> $GITHUB_ENV
           fi
 
+      - name: Check PATH
+        shell: bash -leo pipefail {0}
+        run: echo ${PATH}
+
       - name: Pull Request Build
         shell: bash -leo pipefail {0}
         if: github.event_name == 'pull_request'