build: 🔨 add test template recipe to justfile (#69)

# Description

Adds a `test` recipe so we can test out building it and looking how it
works.

Closes #68

This PR needs an in-depth review.

Author: lwjohnst86

.gitignore

@@ -2,6 +2,7 @@
 _ignore
 bin/
 dev/
+_temp/
 
 # Temporary files
 *.tmp

justfile

@@ -2,7 +2,7 @@
     just --list --unsorted
 
 # Run all build-related recipes in the justfile
-run-all: install-deps format-python check-python check-spelling check-commits
+run-all: install-deps format-python check-python check-spelling check-commits test
 
 # Install the pre-commit hooks
 install-precommit:
@@ -41,3 +41,24 @@ check-commits:
 # Check for spelling errors in files
 check-spelling:
   uv run typos
+
+test:
+  #!/bin/zsh
+  temp_dir="_temp/test-data-package"
+  rm -rf $temp_dir
+  mkdir -p $temp_dir
+  # vcs-ref means the current commit/head, not a tag.
+  # `.` means the current directory contains the template.
+  uvx copier copy --vcs-ref=HEAD . $temp_dir \
+    --defaults \
+    --data package_abbrev= "test-data-package" \
+    --data package_github="first-last/test-data-package" \
+    --data author_given_name="First" \
+    --data author_family_name="Last" \
+    --data author_email="[email protected]"
+  # TODO: Other checks/tests?
+
+cleanup:
+  #!/bin/zsh
+  temp_dir=$("_temp/test-data-package"))
+  rm -rf $temp_dir