[MM-56732] Update keycloak docker configs and add make command (#26313)

* updating keycloak image
---------
Co-authored-by: Mattermost Build <build@mattermost.com>
Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>

server/build/docker/keycloak/README.md

@@ -1,61 +1,12 @@
-To use this keycloak image, we suggest you to use this configuration settings:
+Overwrite your SamlSettings section in your config.json file by running `make config-saml` and restarting your server. You will need to set the following `SamlSettings` in order to complete the setup:
+- Enable: true
+- FirstNameAttribute: "givenName"
+- LastNameAttribute: "surname"
 
-- Enable Login With SAML 2.0: `true`
-- Enable Synchronizing SAML Accounts With AD/LDAP: `true`
-- Override SAML bind data with AD/LDAP information: `false`
-- Identity Provider Metadata URL: empty string
-- SAML SSO URL: `http://localhost:8484/auth/realms/mattermost/protocol/saml`
-- Identity Provider Issuer URL: `http://localhost:8484/auth/realms/mattermost`
-- Identity Provider Public Certificate: The file `keycloak.crt` in this same directory
-- Verify Signature: `true`
-- Service Provider Login URL: `http://localhost:8065/login/sso/saml`
-- Service Provider Identifier: `http://localhost:8065/login/sso/saml`
-- Enable Encryption: `false`
-- Sign Request: `false`
-- Email Attribute: `email`
-- Username Attribute: `username`
-- Id Attribute: `id`
-- First Name Attribute: `firstName`
-- Last Name Attribute: `lastName`
+Admin Login:
+- admin/admin
 
-or overwrite your SamleSettings section with this settings in your config.json file (if you are not using
-database configuration) and restart the server:
-
-```json
-    "SamlSettings": {
-        "Enable": true,
-        "EnableSyncWithLdap": true,
-        "EnableSyncWithLdapIncludeAuth": false,
-        "IgnoreGuestsLdapSync": false,
-        "Verify": true,
-        "Encrypt": false,
-        "SignRequest": false,
-        "IdpUrl": "http://localhost:8484/auth/realms/mattermost/protocol/saml",
-        "IdpDescriptorUrl": "http://localhost:8484/auth/realms/mattermost",
-        "IdpMetadataUrl": "",
-        "ServiceProviderIdentifier": "http://localhost:8065/login/sso/saml",
-        "AssertionConsumerServiceURL": "http://localhost:8065/login/sso/saml",
-        "SignatureAlgorithm": "RSAwithSHA1",
-        "CanonicalAlgorithm": "Canonical1.0",
-        "ScopingIDPProviderId": "",
-        "ScopingIDPName": "",
-        "IdpCertificateFile": "saml-idp.crt",
-        "PublicCertificateFile": "",
-        "PrivateKeyFile": "",
-        "IdAttribute": "id",
-        "GuestAttribute": "",
-        "EnableAdminAttribute": false,
-        "AdminAttribute": "",
-        "FirstNameAttribute": "firstName",
-        "LastNameAttribute": "lastName",
-        "EmailAttribute": "email",
-        "UsernameAttribute": "username",
-        "NicknameAttribute": "",
-        "LocaleAttribute": "",
-        "PositionAttribute": "",
-        "LoginButtonText": "SAML",
-        "LoginButtonColor": "#34a28b",
-        "LoginButtonBorderColor": "#2389D7",
-        "LoginButtonTextColor": "#ffffff"
-    },
-```
+Users:
+- homer/password
+- marge/password
+- lisa/password