IPROTO-383 Allow proto-schema-compatibility-maven-plugin to compare a…

[ryanemerson]

https://issues.redhat.com/browse/IPROTO-383

@tristantarrant This is needed for the Keycloak release, where we intend to eventually check schema compatibility against multiple branches.

Tested using Infinispan commons and the following configuration:

            <plugin>
               <groupId>org.infinispan.protostream</groupId>
               <artifactId>proto-schema-compatibility-maven-plugin</artifactId>
               <version>5.0.9-SNAPSHOT</version>
               <configuration>
                  <commitProtoLock>${commitProtoLockChanges}</commitProtoLock>
                  <remoteLockFiles>https://raw.githubusercontent.com/infinispan/infinispan/refs/heads/main/commons/all/proto.lock</remoteLockFiles>
               </configuration>
            </plugin>

Changing the branch of the remoteLockFiles to 14.0.x will cause the check to fail as expected.

[tristantarrant]

I think you will want to inject MavenSession into the plugin

@Parameter(defaultValue = "${session}")
private MavenSession session;

and then use session.isOffline() to respect Maven's offline setting

[tristantarrant]

In offline mode we may want to allow URLs with the file protocol

[ryanemerson]

We already have protoSourceRoot and protoLockRoot for defining checks against local files.