Install mqttdpms

The `mqttdpms` tool will allow the screens to be turned off and on using
Home Assistant.  We'll install it into the rootfs image by copying the
artifact from its Jenkins build into the overlay tree before building
the image.

ci/Jenkinsfile

@@ -39,6 +39,11 @@ pipeline {
                         sh 'rm -rf _build'
                     }
                 }
+                copyArtifacts \
+                    filter: 'aarch64/mqttdpms',
+                    projectName: 'mqttdpms/master',
+                    selector: lastSuccessful()
+                sh 'install aarch64/mqttdpms overlay/usr/local/bin/'
                 sh 'make rootfs initramfs'
             }
         }

overlay/etc/systemd/user/mqttdpms.service

@@ -0,0 +1,9 @@
+[Unit]
+Description=MQTT DPMS Control
+
+[Service]
+ExecStart=/usr/local/bin/mqttdpms
+Environment=RUST_LOG=info
+Restart=always
+StandardInput=null
+StandardOutput=journal

overlay/home/user/.config/mqttdpms/config.toml

@@ -0,0 +1 @@
+/run/storage/mqttdpms.toml

overlay/home/user/.xinitrc

@@ -7,6 +7,6 @@ TZ="$(curl https://ipapi.co/timezone)"
 export TZ
 
 systemctl --user import-environment DISPLAY TZ
-systemctl --user start firefox-marionette.socket firefox
+systemctl --user start firefox-marionette.socket firefox mqttdpms
 
 exec openbox-session