Fix: [AEA-0000] - run regression test in parallel (#1092)

## Summary

- Routine Change

### Details

- use tag to run regression test in parallel

Author: anthony-nhs

.github/workflows/run_regression_tests.yml

@@ -69,12 +69,22 @@ jobs:
           GITHUB-TOKEN: ${{ steps.generate-token.outputs.token }}
         run: |
               if [[ "$TARGET_ENVIRONMENT" != "prod" && "$TARGET_ENVIRONMENT" != "ref" ]]; then
+                # this should be the tag of the tests you want to run
+                REGRESSION_TEST_REPO_TAG=v3.0.0
+
+                # this should be the tag of the regression test workflow you want to run
+                # This will normally be the same as REGRESSION_TEST_REPO_TAG
+                REGRESSION_TEST_WORKFLOW_TAG=v3.0.0
+
+                curl https://raw.githubusercontent.com/NHSDigital/electronic-prescription-service-api-regression-tests/refs/tags/${REGRESSION_TEST_WORKFLOW_TAG}/scripts/run_regression_tests.py -o run_regression_tests.py
                 poetry install
                 echo Running regression tests in the "$TARGET_ENVIRONMENT" environment
-                poetry run python run_regression_tests.py \
+                poetry run python -u run_regression_tests.py \
                 --env="$TARGET_ENVIRONMENT" \
                 --pr_label="$VERSION_NUMBER" \
                 --token=${{ steps.generate-token.outputs.token }} \
                 --is_called_from_github=true \
-                --product=CPTS-UI
+                --product=CPTS-UI \
+                --regression_test_repo_tag "${REGRESSION_TEST_REPO_TAG}" \
+                --regression_test_workflow_tag "${REGRESSION_TEST_WORKFLOW_TAG}"
               fi