add apex-ready event after post-fs-data am: 1eb3394e9c

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2093005

Change-Id: I57b58e139a1cf3f01de3cb8eea4379a5395bae61
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

rootdir/init.rc

@@ -534,6 +534,10 @@ on late-init
     # /data, which in turn can only be loaded when system properties are present.
     trigger post-fs-data
 
+    # APEXes are ready to use. apex-ready is a public trigger similar to apexd.status=ready which
+    # is a system-private property.
+    trigger apex-ready
+
     # Should be before netd, but after apex, properties and logging is available.
     trigger load_bpf_programs
 
@@ -1290,6 +1294,7 @@ on userspace-reboot-fs-remount
 on userspace-reboot-resume
   trigger userspace-reboot-fs-remount
   trigger post-fs-data
+  trigger apex-ready
   trigger zygote-start
   trigger early-boot
   trigger boot