cluster-bootstrap support TLS requests in client calls

[pjfanning]

• based on code in AbstractKubernetesApiImpl
• whether to use TLS is based on the URL scheme ("https://...")
• the trust store used for the client connection can be configured to read a directory to read certs in a directory (this is optional unlike in AbstractKubernetesApiImpl) - the aim is that you can leave this config blank if you are happy to rely on your JDK's trust store set up.

[Copilot]

Pull Request Overview

This PR adds TLS/HTTPS support to cluster-bootstrap client calls when probing contact points. The implementation is based on the pattern used in AbstractKubernetesApiImpl, with the key difference being that the trust store configuration is optional - users can rely on their JDK's default trust store if ca-path is left empty.

Key Changes

• Added SSL context generation with optional custom certificate trust store
• HTTP client now uses HTTPS connection context when the URI scheme is "https://"
• Comprehensive test coverage for SSL context generation with various configurations

Reviewed Changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
management-cluster-bootstrap/src/main/scala/org/apache/pekko/management/cluster/bootstrap/internal/HttpContactPointBootstrap.scala	Implements SSL context generation and conditionally uses HTTPS connection context based on URI scheme
management-cluster-bootstrap/src/main/scala/org/apache/pekko/management/cluster/bootstrap/ClusterBootstrapSettings.scala	Adds configuration settings for ca-path and tls-version under httpClient
management-cluster-bootstrap/src/main/resources/reference.conf	Adds default configuration for HTTP client SSL/TLS settings
management-cluster-bootstrap/src/test/scala/org/apache/pekko/management/cluster/bootstrap/internal/HttpContactPointBootstrapSpec.scala	Adds comprehensive tests for SSL context generation with various scenarios
management-cluster-bootstrap/src/test/scala/org/apache/pekko/management/cluster/bootstrap/internal/BootstrapCoordinatorSpec.scala	Minor import reorganization
management-cluster-bootstrap/src/test/resources/application.conf	Adds test configuration for actor system
management-cluster-bootstrap/src/test/files/ca.crt	Adds test certificate for SSL context tests
build.sbt	Adds dependency on managementPki module

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[mdedetrich]

lgtm