fix: removed postgre DB username var that wasn't in use

The credentials are provided via a secret named in the values file instead

README.md

@@ -15,7 +15,7 @@ Jira is configured by default to assume the internal dependencies that are used
 #### Database
 
 - A Postgres database is running on port `5432` and accessible to the cluster via the `JIRA_DB_ENDPOINT` Zarf var.
-- This database can be logged into via the username configured with the Zarf var `JIRA_DB_USERNAME`. Default is `jira.jira`
+- This database can be logged into via the username & password given in the postgre connection secret (see `values/common-values.yaml`).
 - This database instance has a psql database created matching what is defined in the Zarf var `JIRA_DB_NAME`. Default is `jiradb`
 - The user has read/write access to the above mentioned database
 - Create `jira-postgres` service in `jira` namespace that points to the psql database

bundle/uds-config.yaml

@@ -1,6 +1,3 @@
-shared:
-  JIRA_DB_USERNAME: "jira.jira"
-
 variables:
   jira:
     jira_db_endpoint: "pg-cluster.postgres.svc.cluster.local"

zarf.yaml

@@ -9,8 +9,6 @@ metadata:
 variables:
   - name: JIRA_DB_NAME
     default: "jiradb"
-  - name: JIRA_DB_USERNAME
-    default: "jira"
   - name: JIRA_DB_ENDPOINT
     default: "postgres"
   - name: DOMAIN