data/config: Add reference configuration file

The file format is TOML[0] but the file extension is .conf to follow the
convention set by Podman.

#828
#851

data/config/meson.build

@@ -0,0 +1,4 @@
+install_data(
+  'toolbox.conf',
+  install_dir: join_paths(get_option('sysconfdir'), 'containers'),
+)

data/config/toolbox.conf

@@ -0,0 +1,17 @@
+[general]
+# Create a toolbox container for a different operating system distro than the
+# host. Cannot be used with 'image'.
+## distro = "fedora"
+
+# Create a toolbox container for a different operating system release than the
+# host. Cannot be used with 'image'.
+## release = "33"
+
+# Change the name of the image used to create the toolbox container. This is
+# useful for creating containers from custom-built images. Cannot be used with
+# 'distro' or 'release'.
+#
+# If the name does not contain a registry, the local image storage will be
+# consulted, and if it's not present there then it will be pulled from a
+# suitable remote registry.
+## image = "registry.fedoraproject.org/fedora-toolbox:34"

data/meson.build

@@ -1 +1,2 @@
+subdir('config')
 subdir('tmpfiles.d')