fix(config): make local dotenv optional

Load a private .env when present, but keep CI configuration in GitHub
runtime variables and retain the tracked template as a guide.

1 files changed, 28 insertions, 0 deletions

diff --git a/tests/test-dotenv-precedence.sh b/tests/test-dotenv-precedence.sh
new file mode 100755
index 0000000..f2cc760
--- /dev/null
+++ b/tests/test-dotenv-precedence.sh
@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+project_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+tmp_dir="$(mktemp -d)"
+trap 'rm -rf "${tmp_dir}"' EXIT
+
+grep -Fqx 'set dotenv-filename := ".env"' "${project_root}/Justfile"
+grep -Fqx '.env' "${project_root}/.gitignore"
+if rg -F -- '--dotenv-path image-template.env' "${project_root}/.github/workflows"; then
+  echo 'CI must not load image-template.env as a dotenv file' >&2
+  exit 1
+fi
+
+printf '%s\n' \
+  'set dotenv-load' \
+  'value := env_var("VALUE")' \
+  'show:' \
+  '    @echo "{{value}}"' > "${tmp_dir}/justfile"
+printf '%s\n' 'VALUE=from-dotenv' > "${tmp_dir}/.env"
+
+[[ "$(cd "${tmp_dir}" && just show)" == 'from-dotenv' ]]
+[[ "$(cd "${tmp_dir}" && VALUE=from-runtime just show)" == 'from-runtime' ]]
+
+mkdir "${tmp_dir}/without-dotenv"
+cp "${tmp_dir}/justfile" "${tmp_dir}/without-dotenv/justfile"
+[[ "$(cd "${tmp_dir}/without-dotenv" && VALUE=from-runtime just show)" == 'from-runtime' ]]