refactor!: lowercase, hyphenate keys

This will potentially break scripts, so time to discuss!

tests/integration/app_secret.bats

@@ -325,6 +325,22 @@ setup(){
   assert_success
 }
 
+@test "ls: show secrets as machine readable" {
+  run $ABRA app secret ls "$TEST_APP_DOMAIN"
+  assert_success
+  assert_output --partial 'false'
+
+  run $ABRA app secret generate "$TEST_APP_DOMAIN" --all
+  assert_success
+
+  run $ABRA app secret ls "$TEST_APP_DOMAIN" --machine
+  assert_success
+  assert_output --partial '"created-on-server":"true"'
+
+  run $ABRA app secret rm "$TEST_APP_DOMAIN" --all
+  assert_success
+}
+
 @test "ls: bail if unstaged changes and no --chaos" {
   run bash -c "echo foo >> $ABRA_DIR/recipes/$TEST_RECIPE/foo"
   assert_success