Add service for mounting /boot using CBM

Author: silkeh

data/clr-boot-manager-mount-boot.service.in

@@ -0,0 +1,11 @@
+[Unit]
+Description=mount @BOOTDIR@ using clr-boot-manager
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=@BINDIR@/clr-boot-manager mount-boot
+ExecStop=@BINDIR@/umount @BOOTDIR@
+
+[Install]
+WantedBy=multi-user.target

data/meson.build

@@ -1,10 +1,18 @@
 # Write systemd unit
 data_conf = configuration_data()
 data_conf.set('BINDIR', path_bindir)
+data_conf.set('BOOTDIR', with_boot_dir)
 
 configure_file(
     input: 'clr-boot-manager-booted.service.in',
     output: 'clr-boot-manager-booted.service',
     configuration: data_conf,
     install_dir: with_systemd_system_unit_dir,
 )
+
+configure_file(
+    input: 'clr-boot-manager-mount-boot.service.in',
+    output: 'clr-boot-manager-mount-boot.service',
+    configuration: data_conf,
+    install_dir: with_systemd_system_unit_dir,
+)