chore(just): define local build and test targets

justfile

@@ -46,6 +46,13 @@ build:
     make \
     {{ rockspec_file }}
 
+local-build:
+  luarocks \
+    --lua-version {{ lua_version }} \
+    make \
+    --tree {{ rocks_tree }} \
+    {{ rockspec_file }}
+
 clean:
   rm -rf build
 
@@ -66,6 +73,14 @@ test PATTERN="_spec":
     {{ rockspec_file }} \
     -- --pattern={{ PATTERN }}
 
+local-test PATTERN="_spec":
+  luarocks \
+    --lua-version {{ lua_version }} \
+    test \
+    --tree {{ rocks_tree }} \
+    {{ rockspec_file }} \
+    -- --pattern={{ PATTERN }}
+
 # Requires a patched version of luacov (https://github.com/lunarmodules/luacov/issues/98#issuecomment-1530491759)
 coverage:
   busted --coverage