feat: resolve repository with akka-token variable

[octonato]

Draft: just exploring some ideas to easy the the token retrieval.

Some extra information that will help understand how this will work.

The precedence order to resolve properties is the following:

• Command line properties (-Dproperty=value) (also anything in ~/.mvn/maven.config)
• User settings.xml properties
• Project POM properties
• Parent POM properties (lowest priority)

This PR is changing the parent pom to have the following:

<properties>
  <akka-token>invalid-token</akka-token>
  <akka-secure-repo>https://repo.akka.io/${akka-token}/secure</akka-secure-repo>
</properties>

<repositories>
    <repository>
        <id>akka-secure</id>
        <name>Akka Secure</name>
        <url>${akka-secure-repo}</url>
    </repository>
</repositories>

If no changes are made, the resulting URL will be https://repo.akka.io/invalid-token/secure. The most effective solution is to detect this scenario and display a clear, informative message to the user.

When a user obtains a token via the CLI, it will be added to their ~/.mvn/maven.config as -Dakka-token=user-token. Alternatively, users can choose to add the token directly to their settings.xml if they prefer.

This approach works well for us because it centralizes the repository configuration in the parent POM, giving us greater control. For instance, if we need to migrate the repository URL, we can simply update the parent POM, rather than asking users to modify their settings.xml files individually.

[octonato]

The idea here is that the CLI could take care of the token and add it to ~/.mvn/maven.config.

This file will have the following content:

=❯ cat ~/.mvn/maven.config
-Dakka-token=user-token-goes-here

It's is automatically loaded by maven and the variables are passed to the build. Therefore, the ${akka-token} variable is resolved.

We should find a way to print a nice message in case it's missing, for example.

[octonato]

@sebastian-alfers / @JustinPihony, would it be possible to fail the download with a clear message in case the passed token is invalid-token?

[octonato]

Most info is in the parent pom. Therefore the settings.xml that we use in the build can define only the repo url.