fix: set a random prefix for opensearch index so multiple deployments don't conflict

Author: eamonnmoloney

test/integration/scenarios/chart-full-setup/Taskfile.yaml

@@ -153,7 +153,8 @@ tasks:
       {{ end }}
     - |
       {{ if eq .TEST_VALUES_SCENARIO "opensearch" }}
-        sed -i 's/custom/{{ .TEST_OPENSEARCH_PREFIX }}/g' {{ .TEST_VALUES_BASE_DIR }}/chart-full-setup/values-integration-test-ingress-{{ .TEST_VALUES_SCENARIO }}.yaml
+        TEST_OPENSEARCH_PREFIX=$(cat /dev/urandom | tr -dc 'A-Za-z0-9' | fold -w 6 | head -n 1)
+        sed -i 's/custom/${TEST_OPENSEARCH_PREFIX}/g' {{ .TEST_VALUES_BASE_DIR }}/chart-full-setup/values-integration-test-ingress-{{ .TEST_VALUES_SCENARIO }}.yaml
       {{ end }}
     - |
       {{ if eq .TEST_AUTH_TYPE "oidc" }}