title: unable to find valid certification path to requested target with Quarkus
body: <p>I have secured my web app with Keycloak that is based on Quarkus. When I start the app:</p>
  <pre><code>./mvnw clean compile quarkus:dev
  </code></pre>
  <p>it shows me:</p>
  <pre><code>io.quarkus.oidc.OIDCException: OIDC server is not available at the 'quarkus.oidc.auth-server-url' URL. Please make sure it is correct. Note it has to end with a realm value if you work with Keycloak, for example: 'https://localhost:8180/auth/realms/quarkus'
  
  Caused by: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  </code></pre>
  <p>The Keycloak server is setting up with certificate <code>https://acme-staging-v02.api.letsencrypt.org/directory</code>(not a valid certificate), because it is a DEV environment.</p>
  <p>The Keycloak configuration on Quarkus:</p>
  <pre><code>quarkus.oidc.auth-server-url=https://dev.oic.databaker.io/auth/realms/databaker
  quarkus.oidc.client-id=svc
  quarkus.oidc.credentials.secret=!!!secret!!!
  quarkus.keycloak.policy-enforcer.enable=true
  quarkus.keycloak.policy-enforcer.paths.1.path=/
  quarkus.keycloak.policy-enforcer.paths.1.enforcement-mode=DISABLED
  quarkus.ssl.native=false
  </code></pre>
  <p>How to bypass the error?</p>