Automatically set keycloak.server.version in documentation

See #51017 (comment)

Author: wjglerum

docs/src/main/asciidoc/_attributes.adoc

@@ -19,6 +19,7 @@
 :logstash-image: ${logstash.image}
 :kibana-image: ${kibana.image}
 :keycloak-docker-image: ${keycloak.docker.image}
+:keycloak-server-version: ${keycloak.server.version}
 :jandex-version: ${jandex.version}
 :jandex-gradle-plugin-version: ${jandex-gradle-plugin.version}
 :kotlin-version: ${kotlin.version}

docs/src/main/asciidoc/security-keycloak-authorization.adoc

@@ -319,7 +319,7 @@ docker run --name keycloak \
   quay.io/keycloak/keycloak:{keycloak.version} \ <1>
   start --hostname-strict=false --https-key-store-file=/etc/keycloak-keystore.jks <2>
 ----
-<1> For `keycloak.version`, ensure the version is `26.4.5` or later.
+<1> For `keycloak.version`, ensure the version is `{keycloak-server-version}` or later.
 <2> For Keycloak keystore, use the `keycloak-keystore.jks` file located at https://github.com/quarkusio/quarkus-quickstarts/blob/main/security-keycloak-authorization-quickstart/config/keycloak-keystore.jks[quarkus-quickstarts/security-keycloak-authorization-quickstart/config].
 
 .Accessing the Keycloak server

docs/src/main/asciidoc/security-oidc-bearer-token-authentication-tutorial.adoc

@@ -217,7 +217,7 @@ For more information, see the <<bearer-token-tutorial-keycloak-dev-mode>> sectio
 docker run --name keycloak -e KC_BOOTSTRAP_ADMIN_USERNAME=admin -e KC_BOOTSTRAP_ADMIN_PASSWORD=admin -p 8180:8080 quay.io/keycloak/keycloak:{keycloak.version} start-dev
 ----
 ====
-* Where the `keycloak.version` is set to version `26.4.5` or later.
+* Where the `keycloak.version` is set to version `{keycloak-server-version}` or later.
 . You can access your Keycloak server at http://localhost:8180[localhost:8180].
 . To access the Keycloak Administration console, log in as the `admin` user by using the following login credentials:
 

docs/src/main/asciidoc/security-oidc-code-flow-authentication-tutorial.adoc

@@ -201,7 +201,7 @@ To start a Keycloak server, use Docker and run the following command:
 docker run --name keycloak -e KC_BOOTSTRAP_ADMIN_USERNAME=admin -e KC_BOOTSTRAP_ADMIN_PASSWORD=admin -p 8180:8080 quay.io/keycloak/keycloak:{keycloak.version} start-dev
 ----
 
-where `keycloak.version` is set to `26.4.5` or later.
+where `keycloak.version` is set to `{keycloak-server-version}` or later.
 
 You can access your Keycloak Server at http://localhost:8180[localhost:8180].
 

docs/src/main/asciidoc/security-openid-connect-client.adoc

@@ -505,7 +505,7 @@ To start a Keycloak Server, you can use Docker and just run the following comman
 docker run --name keycloak -e KC_BOOTSTRAP_ADMIN_USERNAME=admin -e KC_BOOTSTRAP_ADMIN_PASSWORD=admin -p 8180:8080 quay.io/keycloak/keycloak:{keycloak.version} start-dev
 ----
 
-Set `{keycloak.version}` to `26.4.5` or later.
+Set `{keycloak.version}` to `{keycloak-server-version}` or later.
 
 You can access your Keycloak Server at http://localhost:8180[localhost:8180].
 

docs/src/main/asciidoc/security-openid-connect-dev-services.adoc

@@ -247,7 +247,7 @@ For more information, see xref:security-oidc-bearer-token-authentication.adoc#be
 [[keycloak-initialization]]
 === Keycloak initialization
 
-The `quay.io/keycloak/keycloak:26.4.5` image which contains a Keycloak distribution powered by Quarkus is used to start a container by default.
+The `quay.io/keycloak/keycloak:{keycloak-server-version}` image which contains a Keycloak distribution powered by Quarkus is used to start a container by default.
 `quarkus.keycloak.devservices.image-name` can be used to change the Keycloak image name.
 For example, set it to `quay.io/keycloak/keycloak:19.0.3-legacy` to use a Keycloak distribution powered by WildFly.
 Be aware that a Quarkus-based Keycloak distribution is only available starting from Keycloak `20.0.0`.

docs/src/main/asciidoc/security-openid-connect-multitenancy.adoc

@@ -346,7 +346,7 @@ To start a Keycloak server, you can use Docker and run the following command:
 docker run --name keycloak -e KC_BOOTSTRAP_ADMIN_USERNAME=admin -e KC_BOOTSTRAP_ADMIN_PASSWORD=admin -p 8180:8080 quay.io/keycloak/keycloak:{keycloak.version} start-dev
 ----
 
-where `keycloak.version` is set to `26.4.5` or higher.
+where `keycloak.version` is set to `{keycloak-server-version}` or higher.
 
 Access your Keycloak server at http://localhost:8180[localhost:8180].