auto miner do nothing on Alpine Linux - "couldn't query power status from /sys/class/power_supply"
Alpine Linux 3.20 + 0.18.3.3

empty config file, `monerod --detach`, wait  ~10mins

Log line:
```
$ cat bitmonero.log | grep miner
...
2024-12-29 19:18:16.233     14847f8bcb38        ERROR   miner   src/cryptonote_basic/miner.cpp:1073     couldn't query power status from /sys/class/power_supply
...
````

```
$ monerod mining_status
Mining at 0 H/s with 1 threads
PoW algorithm: RandomX
Mining address: 42rQUMr79zn2DT7VXBfLYYPcRMNqtS7QQNbMabMBVV6PLiRHrpUztVpPZXCsE9KX1g3ro5CRaqRXsNLSH6aJD67YG8SB7Fh
Smart mining enabled:
  Target: 40% CPU
  Idle threshold: 90% CPU
  Min idle time: 10 seconds
  Ignore battery: no
```


so, miner CAN work only if i manually set `ignore_battery`:
```
$ monerod start_mining 42rQUMr79zn2DT7VXBfLYYPcRMNqtS7QQNbMabMBVV6PLiRHrpUztVpPZXCsE9KX1g3ro5CRaqRXsNLSH6aJD67YG8SB7Fh 1 yes yes
```
