asterisk: 24.0.0-rc2 image built from source with static config

Adds stub configs and noloads so a clean boot logs no ERROR lines,
ships stock indications.conf, seeds default MOH from the entrypoint.
Spec 01 synced with the real files.

Task: M0-T5

asterisk/conf/asterisk.conf

@@ -0,0 +1,19 @@
+[directories](!)
+astetcdir => /etc/asterisk
+astmoddir => /usr/lib/asterisk/modules
+astvarlibdir => /var/lib/asterisk
+astdbdir => /var/lib/asterisk/db
+astkeydir => /var/lib/asterisk
+astdatadir => /var/lib/asterisk
+astagidir => /var/lib/asterisk/agi-bin
+astspooldir => /var/spool/asterisk
+astrundir => /var/run/asterisk
+astlogdir => /var/log/asterisk
+astsbindir => /usr/sbin
+
+[options]
+verbose = 3
+documentation_language = en_US
+runuser = asterisk
+rungroup = asterisk
+defaultlanguage = en