Chore/real time logging order (#261) (#266)

The current ROS logging is buffered. I.e. `openmower logs` show logs as
buffered blocks but not in real-time as they occur.

This PR changes the buffering to only 1 line so that log entries get
shown when they occur.

I tested with OMOSv2, but did not tested with OMOSv1.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Chores**
* Improved container startup logging configuration to ensure real-time
visibility of application output.
* Optimized environment setup with streamlined version information
sourcing and unbuffered I/O settings.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: Apehaenger

docker/openmower_entrypoint.legacy.sh

@@ -5,7 +5,10 @@ set -e
 source "/opt/ros/$ROS_DISTRO/setup.bash"
 source /opt/open_mower_ros/devel/setup.bash
 
+# setup om environment
+source /opt/open_mower_ros/version_info.env
 source /config/mower_config.sh
+
 # If OM_V2 is truthy, set HARDWARE_PLATFORM=2 and new (yaml-based) config, else 1 and environment config
 if [[ "${OM_V2,,}" =~ ^(true|1|yes)$ ]]; then
     export HARDWARE_PLATFORM=2
@@ -22,6 +25,8 @@ source "$(rospack find open_mower)/params/hardware_specific/$MOWER/default_envir
 export RECORDINGS_PATH=$HOME
 export PARAMS_PATH=$HOME
 
-source /opt/open_mower_ros/version_info.env
+# Ensure stdout and stderr are unbuffered to get logging in real time order
+export ROSCONSOLE_STDOUT_LINE_BUFFERED=1
+export PYTHONUNBUFFERED=1
 
 exec -- "$@"

docker/openmower_entrypoint.sh

@@ -4,6 +4,8 @@ set -e
 # setup ros environment
 source "/opt/ros/$ROS_DISTRO/setup.bash"
 source /opt/open_mower_ros/devel/setup.bash
+
+# setup om environment
 source /opt/open_mower_ros/version_info.env
 
 # OSv2 debugging get controlled via env var DEBUG and has the ROSCONSOLE_CONFIG_FILE embedded
@@ -20,4 +22,8 @@ case "${DEBUG:-0}" in
 esac
 shopt -u nocasematch || true
 
+# Ensure stdout and stderr are unbuffered to get logging in real time order
+export ROSCONSOLE_STDOUT_LINE_BUFFERED=1
+export PYTHONUNBUFFERED=1
+
 exec -- "$@"