adding code to ensur artifact copy commands get run on error when comparing metrics

.gitlab-ci.yml

@@ -165,7 +165,7 @@ epi_fit:
       python3 $PACKAGES_DIR/epimodel/ews/epi_model/epi_fit/params_metrics_file_compare.py       
       /storage/app/EWS_prod/regions/EastAfrica/test_workspace/integration/epi_fit/outputs/optimum_parameters_metrics.csv 
       /storage/app/EWS_prod/regions/EastAfrica/test_workspace/integration/epi_fit/inputs/configs/example_optimum_parameters_metrics.csv 
-      /storage/app/EWS_prod/regions/EastAfrica/test_workspace/integration/epi_fit/outputs/metric_comparison.txt
+      /storage/app/EWS_prod/regions/EastAfrica/test_workspace/integration/epi_fit/outputs/metric_comparison.txt || true
       
       cp -rv $OUTPUT_DIR/*.csv $OUTPUT_DIR/*.json $OUTPUT_DIR/*.txt $OUTPUT_DIR/parameter_sweep_heatmaps $CI_PROJECT_DIR/fitting_outputs/