Journal target support in Loki for ARM build

[spomata]

Describe the bug
I expected Loki ARM build (promtail-linux-arm) to contain support for journal target after reading the related issues which have been closed in the past.

To Reproduce
Steps to reproduce the behavior:

1. Started Promtail (2.7.3 - promtail-linux-arm)
2. Promtail warns in syslog that: "caller=journaltargetmanager.go:29 msg="WARNING!!! Journal target was configured but support for reading the systemd journal is not compiled into this build of promtail!"

Expected behavior
I expected the journal support to be already built into the binary.

Environment:
Raspbian on a Raspberry Pi.

Screenshots, Promtail config, or terminal output
caller=journaltargetmanager.go:29 msg="WARNING!!! Journal target was configured but support for reading the systemd journal is not compiled into this build of promtail!

[jeschkies]

Unfortunately it hasn't been released with 2.7.3: v2.7.3...main#diff-76ed074a9305c04054cdebb9e9aad2d818052b07091de1f20cad0bbac34ffb52R267-R268

You'll need to build it yourself:

docker run -i -v "$(pwd):/src/loki:z" grafana/loki-build-image:0.27.0 dist