Set default Docker image for MongoDB Dev Services

Author: wjglerum

docs/src/main/asciidoc/_attributes.adoc

@@ -22,6 +22,7 @@
 :amqp-image: ${amqp.image}
 :apicurio-registry-image: ${apicurio-registry.image}
 :narayana-lra-image: ${narayana-lra.image}
+:mongo-image: ${mongo.image}
 :jandex-version: ${jandex.version}
 :jandex-gradle-plugin-version: ${jandex-gradle-plugin.version}
 :kotlin-version: ${kotlin.version}

docs/src/main/asciidoc/mongodb-dev-services.adoc

@@ -4,6 +4,7 @@ and pull requests should be submitted there:
 https://github.com/quarkusio/quarkus/tree/main/docs/src/main/asciidoc
 ////
 = Dev Services for MongoDB
+include::_attributes.adoc[]
 
 Quarkus supports a feature called Dev Services that allows you to create various datasources without any config. In the case of MongoDB this support extends to the default MongoDB connection.
 What that means practically, is that if you have not configured `quarkus.mongodb.connection-string` nor `quarkus.mongodb.hosts`, Quarkus will automatically start a MongoDB container when
@@ -35,12 +36,12 @@ You can disable the sharing with `quarkus.mongodb.devservices.shared=false`.
 The MongoDB Dev Services supports xref:compose-dev-services.adoc[Compose Dev Services].
 It relies on a `compose-devservices.yml`, such as:
 
-[source,yaml]
+[source,yaml,subs=attributes+]
 ----
 name: <application name>
 services:
   mongo:
-    image: docker.io/mongo:7.0
+    image: {mongo-image}
     ports:
       - "27017"
 ----

docs/src/main/asciidoc/mongodb.adoc

@@ -372,9 +372,9 @@ startup time if the Mongo Client is inactive. Alternatively, Mongo Clients may a
 As by default, `MongoClient` is configured to access a local MongoDB database on port 27017 (the default MongoDB port), if you have a local running database on this port, there is nothing more to do before being able to test it!
 
 If you want to use Docker to run a MongoDB database, you can use the following command to launch one:
-[source,bash]
+[source,bash,subs=attributes+]
 ----
-docker run -ti --rm -p 27017:27017 mongo:4.4
+docker run -ti --rm -p 27017:27017 {mongo-image}
 ----
 
 [NOTE]

extensions/mongodb-client/deployment/src/main/java/io/quarkus/mongodb/deployment/DevServicesBuildTimeConfig.java

@@ -3,6 +3,7 @@
 import java.util.Map;
 import java.util.Optional;
 
+import io.quarkus.runtime.annotations.ConfigDocDefault;
 import io.quarkus.runtime.annotations.ConfigDocMapKey;
 import io.quarkus.runtime.annotations.ConfigGroup;
 import io.smallrye.config.WithDefault;
@@ -22,6 +23,7 @@ public interface DevServicesBuildTimeConfig {
     /**
      * The container image name to use, for container based DevServices providers.
      */
+    @ConfigDocDefault(value = "`{mongo-image}`", escape = false)
     Optional<String> imageName();
 
     /**