Add jpkg packaging to CI

ober

554231aa06575285d120bc63aaf204e32852fb56

diff --git a/.builds/ci.yml b/.builds/ci.yml
index 91b84e5..3156fb0 100644
--- a/.builds/ci.yml
+++ b/.builds/ci.yml
@@ -16,10 +16,22 @@ packages:
 sources:
 - https://git.sr.ht/~lisp/jerboa
 - https://git.sr.ht/~lisp/jerboa-search
+artifacts:
+- jerboa-search/jerboa-search-0.1.0.jpkg
 tasks:
 - build-jerboa: |
     cd jerboa
     make jerboa
+    echo 'export PATH="$HOME/jerboa/dist:$PATH"' >> ~/.buildenv
+- package: |
+    cd jerboa-search
+    J="$HOME/jerboa/dist/jerboa"
+    "$J" pkg verify
+    "$J" pkg policy
+    "$J" pkg build
+    "$J" pkg pack --output "$PWD/jerboa-search-0.1.0.jpkg"
+    "$J" pkg verify "$PWD/jerboa-search-0.1.0.jpkg"
+    "$J" pkg verify --reproduce
 - verify: |
     cd jerboa-search
     PATH="$HOME/jerboa/dist:$PATH" JERBUILD="$HOME/jerboa/dist/jerbuild" make test