[OPENJDK-3038] echo out Tech Preview warning

The jlink feature will initially ship as TP.

https://issues.redhat.com/browse/OPENJDK-3038

Signed-off-by: Jonathan Dowland <[email protected]>

Author: jmtd

modules/jlink/artifacts/opt/jboss/container/java/jlink/preflight.sh

@@ -1,3 +1,10 @@
+jlink_techpreview_warning()
+{
+  echo "Jlink integration is a Tech Preview feature."
+  echo "See <https://access.redhat.com/support/offerings/techpreview/>"
+  echo "for more information."
+}
+
 jlink_preflight_check()
 {
     # preflight check: do we have what we need?

modules/jlink/tests/features/jlink.feature

@@ -7,6 +7,7 @@ Scenario: Ensure jlinked builder is used to build the containerized application
        | S2I_ENABLE_JLINK    | true         |
        | QUARKUS_PACKAGE_TYPE| uber-jar     |
       Then run ls /tmp/jre in container and check its output for bin
+       And container log should contain Jlink integration is a Tech Preview feature.
 
 Scenario: Ensure S2I_ENABLE_JLINK is not set to true
       Given s2i build https://github.com/jboss-container-images/openjdk-test-applications from quarkus-quickstarts/getting-started-3.0.1.Final-nos2i

modules/s2i/bash/artifacts/usr/local/s2i/assemble

@@ -22,6 +22,7 @@ setup_java_app_and_lib
 if [ "$S2I_ENABLE_JLINK" = "true" ]; then
 
     source "${JBOSS_CONTAINER_JAVA_JLINK_MODULE}/preflight.sh"
+    jlink_techpreview_warning
     jlink_preflight_check
 
     source "${JBOSS_CONTAINER_JAVA_JLINK_MODULE}/mkdeps.sh"