Provide list of compatible Keycloak releases

[stianst]

Description

Automatically provide lists of what versions of Keycloak a given release of the extension is compatible with.

An extension may have multiple releases, and each release may have different versions of Keycloak it is compatible with.

For example:

• 0.1.0 - Keycloak 22,23,24
• 0.2.0 - Keycloak 24

Discussion

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Motivation

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Details

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[thomasdarimont]

We could add support some additional metadata in the jar manifest, to allow Keycloak to determine compatibility without having to load the extension form the jar.

Keycloak-Min-Version: 25.0 - min supported Keycloak Version
Keycloak-Max-Version: 26.0 - max supported Keycloak Version,
Keycloak-Features-Required: oid4vci

Instead of using a jar Manifest, we could also let an extension provide some Java class that provides that metadata, either via a simple API or via Annotations.

[stianst]

We could add support some additional metadata in the jar manifest, to allow Keycloak to determine compatibility without having to load the extension form the jar.

Keycloak-Min-Version: 25.0 - min supported Keycloak Version Keycloak-Max-Version: 26.0 - max supported Keycloak Version, Keycloak-Features-Required: oid4vci

Instead of using a jar Manifest, we could also let an extension provide some Java class that provides that metadata, either via a simple API or via Annotations.

Min-version could be for sure, but don't think max-version should be.

For supported versions of Keycloak we could instead just rely on testing. If a provider has sufficient tests, and we have some GitHub Actions magic to test the current release with a KC version, then we can "certify" a provider with a new release, without having to always release all providers to support a new KC version.