Introduce :launchpad/jdk-opts

Make sure we populate the internal :java-args from the above-mentioned
key, therefore allowing `deps.local.edn` to contain things that differ
from `deps.edn`.

Note that there is naming discrepancy as this patch sticks with the
official key - `:jdk-opts` rather than the internal key name.

Author: arichiardi

src/lambdaisland/launchpad.clj

@@ -251,6 +251,9 @@
         (update :main-opts (fnil into []) (concat
                                            (:launchpad/main-opts deps-system)
                                            (:launchpad/main-opts deps-local)))
+        (update :java-args (fnil into []) (concat
+                                           (:launchpad/jdk-opts deps-system)
+                                           (:launchpad/jdk-opts deps-local)))
         (merge
          (:launchpad/options deps-system)
          (:launchpad/options deps-local))