CRITICAL: Correct dangerous claims about bootc production readiness

EXPERIMENTAL WARNINGS:
- Add prominent warnings that bootc on Debian is HIGHLY EXPERIMENTAL
- Clarify that NO reproducible bootc images exist yet
- Warn that everything is still experimental and not production-ready
- Add DO NOT use in production warnings throughout

DEBIAN VERSION CORRECTIONS:
- Use Debian Sid (unstable) for base image building (like Fedora rawhide)
- Correct dangerous claims about 'tested' configurations
- Mark all configurations as experimental, not tested
- Remove false claims about production readiness

SAFETY IMPROVEMENTS:
- Add experimental warnings to all base image documentation
- Clarify that bootc is not stable on Debian yet
- Emphasize testing-only use on virtual machines
- Remove misleading production recommendations

This corrects dangerous misinformation that could lead to
data loss and system instability in production environments.

building/base-images-wo-bootc.md

@@ -1,5 +1,14 @@
 # Create bootc base images without bootc
 
+⚠️ **EXPERIMENTAL WARNING** ⚠️
+
+**bootc on Debian is HIGHLY EXPERIMENTAL and NOT production-ready!**
+
+- **No reproducible bootc images exist yet** - Everything is experimental
+- **Use only for testing** on virtual machines or test hardware
+- **Expect failures** - bootc is not stable on Debian
+- **DO NOT use in production** - Data loss and system instability possible
+
 The bootc binary is unreliable under Debian as it's mainly developed for Fedora despite it aiming to be a distro agnostic tool.
 
 In this doc we'll go over all the little things a base bootc needs to be considered a true bootc image.
@@ -312,7 +321,7 @@ echo "Example: podman build -f examples/nginx/Containerfile -t ${IMAGE_NAME}:ngi
 ```dockerfile
 # Containerfile.wo-bootc - Build bootc base without bootc binary
 
-FROM debian:trixie-slim
+FROM debian:sid-slim
 
 # Install essential packages for bootc
 RUN apt update && apt install -y \
@@ -998,7 +1007,7 @@ CMD ["/lib/systemd/systemd"]
 
 ```dockerfile
 # examples/nginx/Containerfile.multistage
-FROM debian:trixie-slim as base
+FROM debian:sid-slim as base
 
 # Install base packages
 RUN apt update && apt install -y \

building/base-images.md

@@ -1,5 +1,14 @@
 # Building Base bootc Images
 
+⚠️ **EXPERIMENTAL WARNING** ⚠️
+
+**bootc on Debian is HIGHLY EXPERIMENTAL and NOT production-ready!**
+
+- **No reproducible bootc images exist yet** - Everything is experimental
+- **Use only for testing** on virtual machines or test hardware
+- **Expect failures** - bootc is not stable on Debian
+- **DO NOT use in production** - Data loss and system instability possible
+
 This document provides detailed instructions for creating base bootc images using two different approaches:
 
 1. **Method 1**: Building from an existing OCI image
@@ -33,7 +42,7 @@ Create a `Containerfile.base`:
 
 ```dockerfile
 # Containerfile.base - Convert existing Debian image to bootc base
-FROM debian:trixie-slim
+FROM debian:sid-slim
 
 # Install essential packages for bootc
 RUN apt update && apt install -y \