fix: refactor publish command (#11)

## Description

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relates to #1234

## Checklist

- [ ] Issue was linked above
- [ ] Code format was applied: `make fmt`
- [ ] Examples were added / adjusted (see `examples/` directory)
- [x] Docs are up-to-date: `make generate-docs` (will be checked by CI)
- [ ] Unit tests got implemented or updated
- [ ] Acceptance tests got implemented or updated (see e.g. [here](f5f99d1709/stackit/internal/services/dns/dns_acc_test.go))
- [x] Unit tests are passing: `make test` (will be checked by CI)
- [x] No linter issues: `make lint` (will be checked by CI)

Reviewed-on: #11
Co-authored-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>
Co-committed-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>

docs/resources/postgresflexalpha_instance.md

@@ -62,6 +62,7 @@ import {
 
 ### Read-Only
 
+- `connection_info` (Attributes) The DNS name and port in the instance overview (see [below for nested schema](#nestedatt--connection_info))
 - `id` (String) The ID of the instance.
 - `is_deletable` (Boolean) Whether the instance can be deleted or not.
 - `status` (String) The current status of the instance.
@@ -98,3 +99,12 @@ Required:
 - `kek_key_ring_id` (String) The encryption-key keyring identifier
 - `kek_key_version` (String) The encryption-key version
 - `service_account` (String)
+
+
+<a id="nestedatt--connection_info"></a>
+### Nested Schema for `connection_info`
+
+Read-Only:
+
+- `host` (String) The host of the instance.
+- `port` (Number) The port of the instance.