feat(script): Add script

notify_signal_about_traccar_events.sh.conf.example

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+# First positional argument '%s' is Traccar device name, second
+# positional argument '%s' is geofence name, third one is battery level.
+# This cannot be switched around, please word your message accordingly.
+# Notice how a line break takes the form '\\n', that's two backslashes.
+message_geofence_enter='%s entered geofence %s.\\n\\nBattery level %s%%.'
+message_geofence_exit='%s left geofence %s.\\n\\nBattery level %s%%.'
+
+# Argument '%s' is Traccar device name
+message_device_online='On %s Traccar Client app is now active.'
+message_device_unknown='On %s Traccar Client app has not checked in for 10 minutes, the app is likely off now.'
+message_device_offline='On %s Traccar Client app is now off.'
+
+# Argument '%s' is Traccar device name but this one unlike the three
+# message strings before is used as stdout log output when the device ID
+# that triggered an event doesn't match our allow list in
+# allow_unique_device_ids_posix_ere, see below. Note a trailing '\n'
+# (backslash-n) at the end of this string. This is a Bash printf
+# replacement string.
+message_device_unhandled='For %s we do not want to send Signal messages. Nothing to do.\n'
+
+# First positional argument '%s' is Traccar device name, second
+# positional argument '%s' is event name. This cannot be switched
+# around, please word your message accordingly.
+message_event_other='%s triggered event "%s" in Traccar server.'
+
+# If this is a non-empty value we'll use it to only handle Traccar
+# events for these unique device IDs. Events triggered by other device
+# IDs will be discarded. If this is an empty string or if it's not
+# declared at all we'll handle events for all device IDs. In Traccar
+# server every device has a unique ID that's distinct from its
+# pretty-printed device name. This is a Posix Extended Regular
+# Expression (ERE). Most Perl-Compatible Regular Expression (PCRE)
+# syntax works. Most notably lookarounds are unsupported in ERE.
+allow_unique_device_ids_posix_ere='^(901874|81919333|9991212)$'
+
+# signal-cli-rest-api config
+signal_sender_phone_number='+18005550199'
+signal_recipients_array='["group.ImxvbmdpdH=","recipient.21","+18005550111","i-am-a-uuid"]'
+signal_api_endpoint_full_path='https://fully.qualified.domain.name/v2/send'