Restore capability to customize OIDC login button text (regression from v4)

[mulder999]

Current Behavior

In Dependency-Track v4, administrators could customize the text displayed on the OpenID Connect (OIDC) login button using the DT_OIDC_LOGIN_BUTTON_TEXT environment variable.

Following the UI/UX overhaul in v5, this capability was removed and replaced by a static OIDC logo/generic button layout. A completely generic, un-labeled button forces users to click it just to discover where it leads. This creates a confusing and poor user experience, as the target identity provider is entirely hidden.

Proposed Behavior

We would like to optionally re-enable the customization behavior found in v4.

• Introduce a configuration property (e.g., OIDC_LOGIN_BUTTON_TEXT) that allows administrators to specify custom text string.
• If specified, the custom text should render inside the OIDC login button on the frontend replacing or supplementing the default v5 layout.

Checklist

• I have read and understand the contributing guidelines
• I have checked the existing issues for whether this enhancement was already requested

[nscuro]

The feature still exists like it did in v4. But note that the env var is not DT_OIDC_LOGIN_BUTTON_TEXT but still OIDC_LOGIN_BUTTON_TEXT: https://github.com/search?q=repo%3ADependencyTrack%2Ffrontend%20OIDC_LOGIN_BUTTON_TEXT&type=code

The other frontend env vars also don't have the DT_ prefix.