~xdavidwu/saf-cephfs

CephFSDocumentsProvider: reduce io need for thumbnails on dir listing
CephFSDocumentsProvider: basic xdg-style thumbnail support

needs more work on reducing io @ dir listing, and perhaps validations
ceph: upgrade to reef
move to android-ndk-beta

for better c++20 stdlib support, and prepare for moving to reef
ceph: v17.2.6 rebase
link libcephfs-jni java parts instead of copying
README: document new build approach
jni: add libc++_shared.so link as blob into jniLibs

somehow gradle did not pick this up, needed by libboost

TODO: find out how agp deals with lib deps
gradle: wire up ceph
add our ceph fork as a submodule

to be wired up with gradle later
Containerfile: riggings for ghcr
Containerfile: initial work for containerized building

one step forward to finally hook ceph cmake onto gradle?
maybe we still want to ship prebuilts on a build variant for faster
development? idk
or, can we eventually hook every dependencies and stop using aur
contents, which make containerization not really that desired?
update gradle & wrapper

makes gradlew works without bash and which
build: update toolchain, opt-in predictive back
update prebuilts

brief changelog:
ceph v17.2.3, openssl 1.1.1q, ndk r25.b
README: update status, drop WIP flag

while this is not done, it is already useful enough for general cases
DocumentsProvider: set client_dirsize_rbytes=false
update prebuilts

brief changelog:
ceph v17.2.1, with logcat hack, dirsize_rbytes=false performance fix
openssl 1.1.1p
jni: update to quincy
MediaMetadataReader: support audio
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