add logout-button to error-template

Author: clauyan

README.md

@@ -20,7 +20,7 @@ Following steps are intent to build the container for local development purpose.
 You may use a pre-build image from [`GitHub Packages`](https://github.com/orgs/hpi-schul-cloud/packages?repo_name=dbildungs-iam). To build the container on your own execute following command:
 
 ```bash
-docker build --target development -t dbildungsplattform/dbildungs-iam-keycloak/dev .
+docker build --load --target development -t dbildungsplattform/dbildungs-iam-keycloak/dev .
 ```
 
 To create the container execute following command:

src/themes/schulportal/login/error.ftl

@@ -0,0 +1,21 @@
+<#import "template.ftl" as layout>
+<@layout.registrationLayout displayMessage=false; section>
+    <#if section = "header">
+        ${kcSanitize(msg("errorTitle"))?no_esc}
+    <#elseif section = "form">
+        <div id="kc-error-message">
+            <p class="instruction">${kcSanitize(message.summary)?no_esc}</p>
+            <form id="kc-form-logout" 
+                <#if client?? && client.baseUrl?has_content>
+                    action="${client.baseUrl}api/auth/logout"
+                <#else>
+                    action="/realms/${realm.name}/protocol/openid-connect/logout"
+                </#if>
+                >
+                <div id="kc-form-buttons" class="${properties.kcFormGroupClass!}">
+                    <input tabindex="1" class="${properties.kcButtonClass!} ${properties.kcButtonPrimaryClass!} ${properties.kcButtonBlockClass!} ${properties.kcButtonLargeClass!}" name="logout" id="kc-logout" data-testid="logout-button" type="submit" value="${msg("logout")}"/>
+                </div>
+            </form>
+        </div>
+    </#if>
+</@layout.registrationLayout>

src/themes/schulportal/login/messages/messages_de.properties

@@ -5,6 +5,7 @@ enterOldPassword=Bitte geben Sie Ihr aktuelles Passwort ein.
 help=Hilfe
 legalNotice=Impressum
 loginAccountTitle=Anmeldung
+logout=Abmelden
 passwordConfirm=Neues Passwort erneut eingeben
 passwordHelpText=Passwort vergessen?<br>Wenden Sie sich an Ihre schulischen Administratorinnen und Administratoren.
 passwordNew=Neues Passwort eingeben