Implement PECBRIDGE_ADMIN_MAIL env var

If PECBRIDGE_ADMIN_MAIL is added to the environment file, Pec Bridge
uses its value to expand the XML configuration file. The value must be
an email address, which Pec Bridge uses to send a copy of notification
messages.

imageroot/systemd/user/pecbridge.service

@@ -18,6 +18,7 @@ ExecStart=/usr/bin/podman run \
     --cgroups=no-conmon \
     --replace --name=%N \
     --env-file webapp.env \
+    --env PECBRIDGE_ADMIN_MAIL \
     --volume=./webtop.properties:/etc/webtop/webtop.properties:z \
     --entrypoint=/usr/share/pecbridge/bin/run.sh \
     ${WEBTOP_WEBAPP_IMAGE}

webapp/usr/share/pecbridge/bin/run.sh

@@ -5,15 +5,19 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 #
 
+set -e
+
 PBHOME="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd )"
 
 cd "$PBHOME"
 
-CLASSPATH=lib/*:classes
+CLASSPATH="lib/*:classes"
 export PATH CLASSPATH
 
 # Expand the Pecbridge configuration file template:
-sed "s/WEBAPP_API_TOKEN/${WEBAPP_API_TOKEN:?}/" etc/config.xml.template > etc/config.xml
+sed -e "s/WEBAPP_API_TOKEN/${WEBAPP_API_TOKEN:?}/" \
+    ${PECBRIDGE_ADMIN_MAIL:+-e "1 s/sonicle-pec-bridge /sonicle-pec-bridge adminMail=\"${PECBRIDGE_ADMIN_MAIL}\" /"} \
+    etc/config.xml.template > etc/config.xml
 
 # Start the Pecbridge process
 exec java com.sonicle.pecbridge.Main etc/config.xml