Add systemd timers to auto-mute/unmute when idle-inhibit is active

Mutes audio at 21:00 and unmutes at 07:00, but only when the
idle-inhibit toggle is active (PID file exists). This is useful
for leaving the computer running overnight for SSH access while
keeping it quiet for sleeping.

systemd/user/auto-mute.service

@@ -0,0 +1,7 @@
+[Unit]
+Description=Mute audio when idle-inhibit is active
+
+[Service]
+Type=oneshot
+ExecCondition=/bin/bash -c 'test -f ${XDG_RUNTIME_DIR}/idle-inhibit.pid && kill -0 $(cat ${XDG_RUNTIME_DIR}/idle-inhibit.pid)'
+ExecStart=/usr/bin/wpctl set-mute @DEFAULT_AUDIO_SINK@ 1

systemd/user/auto-mute.timer

@@ -0,0 +1,9 @@
+[Unit]
+Description=Mute audio at 21:00
+
+[Timer]
+OnCalendar=*-*-* 21:00:00
+Persistent=false
+
+[Install]
+WantedBy=timers.target

systemd/user/auto-unmute.service

@@ -0,0 +1,7 @@
+[Unit]
+Description=Unmute audio when idle-inhibit is active
+
+[Service]
+Type=oneshot
+ExecCondition=/bin/bash -c 'test -f ${XDG_RUNTIME_DIR}/idle-inhibit.pid && kill -0 $(cat ${XDG_RUNTIME_DIR}/idle-inhibit.pid)'
+ExecStart=/usr/bin/wpctl set-mute @DEFAULT_AUDIO_SINK@ 0

systemd/user/auto-unmute.timer

@@ -0,0 +1,9 @@
+[Unit]
+Description=Unmute audio at 07:00
+
+[Timer]
+OnCalendar=*-*-* 07:00:00
+Persistent=false
+
+[Install]
+WantedBy=timers.target