Add opt-in root access, persistent containers and per-project packages

.claudio

@@ -19,6 +19,23 @@ MOUNTS=(
 GUI=0
 AUDIO=0
 
+# ROOT=1: passwordless sudo inside the container (e.g. to apt-get install tools).
+#         System changes are lost when the container exits, unless PERSIST=1.
+ROOT=0
+
+# PERSIST=1: keep this project's container between runs, so system changes
+#            (packages installed with sudo, files outside mounts) survive.
+#            It is recreated, losing them, when the settings here or the image
+#            change. `claudio reset` removes it.
+PERSIST=0
+
+# Extra Debian packages, built into a per-project image. Unlike changes made
+# with sudo, these survive `claudio update` and PERSIST recreations.
+PACKAGES=(
+    # python3
+    # nodejs
+)
+
 # Extra `podman run` options (env vars, ports, resources, ...).
 PODMAN_ARGS=(
     # -e GITHUB_TOKEN