Add OIDC capability

Author: HerrDerb

core/deployment/src/main/java/io/quarkus/deployment/Capability.java

@@ -106,6 +106,8 @@ public interface Capability {
     String OPENSHIFT = QUARKUS_PREFIX + "openshift";
     String OPENSHIFT_CLIENT = OPENSHIFT + ".client";
 
+    String OIDC = QUARKUS_PREFIX + ".oidc";
+
     /**
      * Presence of an io.opentracing tracer (for example, Jaeger).
      */

extensions/oidc/runtime/pom.xml

@@ -57,6 +57,11 @@
             <plugin>
                 <groupId>io.quarkus</groupId>
                 <artifactId>quarkus-extension-maven-plugin</artifactId>
+                  <configuration>
+                    <capabilities>
+                        <provides>io.quarkus.oidc</provides>
+                    </capabilities>
+                </configuration>
             </plugin>
             <plugin>
                 <artifactId>maven-compiler-plugin</artifactId>