Add Fedora 43 test container with supervisord-managed Check_MK agent

Dockerfile_fedora-43

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+FROM fedora:43
+
+LABEL maintainer="henri@nagstamon.de"
+LABEL description="Fedora 43 with Check_MK agent running via supervisord on port 6556"
+
+# Install required packages (no xinetd as per requirements)
+RUN dnf -y update && \
+    dnf -y install \
+        supervisor \
+        nmap-ncat \
+        && \
+    dnf clean all
+
+# Copy and install Check_MK agent from repository
+COPY check_mk_agent.linux /usr/bin/check_mk_agent
+RUN chmod +x /usr/bin/check_mk_agent
+
+# Create a wrapper script to run check_mk_agent as a TCP service on port 6556
+RUN printf '#!/bin/bash\n\
+# Run check_mk_agent as a TCP service on port 6556 using netcat\n\
+while true; do\n\
+    /usr/bin/nc -l -p 6556 -c '\''/usr/bin/check_mk_agent'\'' || sleep 1\n\
+done\n' > /usr/local/bin/check_mk_agent_tcp && \
+    chmod +x /usr/local/bin/check_mk_agent_tcp
+
+# Copy supervisord configuration files
+COPY supervisord-checkmk.conf /etc/supervisord.conf
+
+# Create log directory for supervisor
+RUN mkdir -p /var/log/supervisor
+
+# Expose check_mk_agent port
+EXPOSE 6556
+
+# Start supervisord
+CMD ["/usr/bin/supervisord", "-c", "/etc/supervisord.conf"]

README_Dockerfile_fedora-43.md

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+# Dockerfile_fedora-43
+
+This Dockerfile creates a Fedora 43 container with Check_MK agent running via supervisord on port 6556 for testing purposes.
+
+## Features
+
+- **Base Image**: Fedora 43
+- **No xinetd**: Uses supervisord instead of xinetd for process management
+- **Check_MK Agent**: Official Check_MK agent (version 2.3.0) listening on port 6556
+- **Supervisord**: Manages the check_mk_agent process with automatic restart capability
+
+## Files
+
+- `Dockerfile_fedora-43`: The main Dockerfile
+- `supervisord-checkmk.conf`: Supervisord configuration file
+- `check_mk_agent.linux`: Official Check_MK agent script from CheckMK repository
+
+## Building the Image
+
+```bash
+docker build -f Dockerfile_fedora-43 -t fedora43-checkmk:latest .
+```
+
+## Running the Container
+
+```bash
+docker run -d --name checkmk-agent -p 6556:6556 fedora43-checkmk:latest
+```
+
+## Testing the Agent
+
+You can test the agent by connecting to port 6556:
+
+```bash
+echo | nc localhost 6556
+```
+
+Or using telnet:
+
+```bash
+telnet localhost 6556
+```
+
+## Managing the Agent
+
+Check the status of the agent:
+
+```bash
+docker exec checkmk-agent supervisorctl status
+```
+
+Restart the agent:
+
+```bash
+docker exec checkmk-agent supervisorctl restart check_mk_agent
+```
+
+View logs:
+
+```bash
+docker logs checkmk-agent
+```
+
+## Architecture
+
+The container uses the following architecture:
+
+1. **supervisord** runs as PID 1 and manages all processes
+2. **check_mk_agent_tcp** wrapper script listens on port 6556 using netcat
+3. When a connection is made, netcat executes `/usr/bin/check_mk_agent`
+4. The agent returns system information in Check_MK format
+
+## Notes
+
+- The agent runs as root to access system information
+- Supervisord automatically restarts the agent if it crashes
+- The netcat loop ensures the agent continues listening even if a connection fails
+- No xinetd is installed, making the container more lightweight