Copy (not cat) initial rtl_433.conf.template

[cretep]

Summary

An empty file was being written by cat to:
/config/rtl_433/rtl_433.conf.template

When using cp the contents is present.
Hopefully more multi-arch/futureproof.

Observed in latest add-on image running on HA OS "Generic x86_64":

• io.hass.base.image: alpine:3.21
• io.hass.base.arch: amd64
• io.hass.base.version: 2025.05.0

Alternatives Considered

I haven't dug into bashio scripts to root cause. It's a weird issue as executing the cat section of run.sh with pure bash works fine.

Reproduction Steps of Original Issue

1. Clean /config/ (ie. no rtl_433/)
2. Install & start latest rtl_433 add-on (ie. at 037c802 "0.6.0")
3. Observe rtl_433 binary starts without any config; /config/rtl_433/rtl_433.conf.template directory and file is created but file is empty.

Testing Steps

1. Clean /config/ (ie. no rtl_433/)
2. Install, local build, & start rtl_433 add-on
3. Observe /config/rtl_433/rtl_433.conf.template populated and rtl_433 binary immediately consumes config and logs [rtl_433] MQTT: Publishing MQTT data ...

[PaulSD]

The root cause is that the $1 at the end of this comment needs to be escaped as \$1:
# rtl_433 -R help 2>&1 | grep -i tpms | sd '.*\[(\d+)\].*' 'protocol -$1'

Without the escape, bash tries to evaluate that variable while reading the text block (before passing the text block to cat), and because bashio runs set -o nounset, this causes bash to fail/exit.

You can fix this simply by escaping that $1 in run.sh.