Request for an optional "Apply for an account with eduGAIN" button

[Sae126V]

Resolves #522

Added an anchor tag with the content saying "Apply for an account with eduGAIN".

[Sae126V]

[Sample on how it looks like]

[rmiccoli]

LGTM 👍

[giacomini]

Not necessarily with this PR, but we should probably use the same terminology commonly found on web services: "sign up" or "register".

[rmiccoli]

Enable the "Apply for an account with EduGAIN" button only if SAML is enabled.
e.g. <c:if test="${loginPageConfiguration.samlEnabled}">

[Sae126V]

Enable the "Apply for an account with EduGAIN" button only if SAML is enabled. e.g. <c:if test="${loginPageConfiguration.samlEnabled}">

Make sense. This will be visible only if SAML is enabled now.

[enricovianello]

I think there's not only EduGAIN as a SAML provider. If you configured another SAML remote provider you'll see a non sense button with the label "Apply for an account with EduGAIN" or am I wrong? And if we add this button for each OIDC/SAML provider configured the login page could contain lots of buttons. Probably we need to add a configuration parameter for each SAML endpoint configured that enables or not its own, specific "Apply for an account with ..." button.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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