Add IPMI fan control scripts, reading credentials from conf/

ipmi-fancontrol.service pins the fans to a fixed speed on start and hands
control back to the BMC's automatic curve on stop, to quiet the chassis.

BMC credentials are read from conf/ipmi-fancontrol.conf, resolved relative
to the scripts themselves so the tree stays self-contained whether it is run
from a checkout or from /opt/ergosteur. See conf/ipmi-fancontrol.conf.example.

Use ipmitool -E rather than -P so the password is passed via the environment
instead of argv, where any local user could read it out of ps.

docker-idrac.sh is the alternative temperature-aware controller.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docker-idrac.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+docker run -d \
+  --name Dell_iDRAC_fan_controller \
+  --restart=unless-stopped \
+  -e IDRAC_HOST=local \
+  -e FAN_SPEED=24 \
+  -e CPU_TEMPERATURE_THRESHOLD=70 \
+  -e CHECK_INTERVAL=60 \
+  -e DISABLE_THIRD_PARTY_PCIE_CARD_DELL_DEFAULT_COOLING_RESPONSE=true \
+  --device=/dev/ipmi0:/dev/ipmi0:rw \
+  tigerblue77/dell_idrac_fan_controller:latest