Fix eink-scheduler bbappend: Add COMPATIBLE_MACHINE restriction

- Restrict bbappend to imx93-jaguar-eink builds only
- Prevents build errors on Sentai and other machines where eink-scheduler recipe doesn't exist
- Fixes 'No recipes in default available for eink-scheduler_git.bbappend' error

Author: Alex J Lennon

bbappends/meta-rust-bin/recipes-rust/eink-scheduler/eink-scheduler_git.bbappend

@@ -1,3 +1,7 @@
+# Only apply this bbappend to imx93-jaguar-eink builds
+# eink-scheduler is not included in Sentai or other builds
+COMPATIBLE_MACHINE = "imx93-jaguar-eink"
+
 # Disable eink-scheduler service by default to prevent board from sleeping too quickly
 # This allows easier SSH access for debugging and testing
 # Service can be manually enabled with: systemctl enable eink-scheduler