Keep phone awake when audio is playing

[3x5co]

I want my phone to auto suspend, but not if music is playing. My player, gmusicbrowser, has an option to prevent a screensaver when the player is playing and fullscreen. However, it doesn't work on the Mobian Pinephone.

There's a program called caffeine that is supposed to let you tweak your sleep settings, but I can't install it on Mobian. I get these errors:

```
md5sum: /usr/lib/crust/scp.bin: No such file or directory
E: Sub-process if grep -qE '(u-boot-sunxi|arm-trusted-firmware)'; then touch /tmp/upgrade-uboot; else md5sum /usr/lib/crust/scp.bin > /tmp/crust.md5; fi returned an error code (1)
E: Failure running script if grep -qE '(u-boot-sunxi|arm-trusted-firmware)'; then touch /tmp/upgrade-uboot; else md5sum /usr/lib/crust/scp.bin > /tmp/crust.md5; fi

```

Any ideas?