filer store: add foundationdb (#7178)

* add foundationdb

* Update foundationdb_store.go

* fix

* apply the patch

* avoid panic on error

* address comments

* remove extra data

* address comments

* adds more debug messages

* fix range listing

* delete with prefix range; list with right start key

* fix docker files

* use the more idiomatic FoundationDB KeySelectors

* address comments

* proper errors

* fix API versions

* more efficient

* recursive deletion

* clean up

* clean up

* pagination, one transaction for deletion

* error checking

* Use fdb.Strinc() to compute the lexicographically next string and create a proper range

* fix docker

* Update README.md

* delete in batches

* delete in batches

* fix build

* add foundationdb build

* Updated FoundationDB Version

* Fixed glibc/musl Incompatibility (Alpine → Debian)

* Update container_foundationdb_version.yml

* build SeaweedFS

* build tag

* address comments

* separate transaction

* address comments

* fix build

* empty vs no data

* fixes

* add go test

* Install FoundationDB client libraries

* nil compare

weed/filer/foundationdb/doc.go

@@ -0,0 +1,13 @@
+/*
+Package foundationdb provides a FoundationDB-based filer store for SeaweedFS.
+
+FoundationDB is a distributed ACID database with strong consistency guarantees
+and excellent scalability characteristics. This filer store leverages FDB's
+directory layer for organizing file metadata and its key-value interface for
+efficient storage and retrieval.
+
+The referenced "github.com/apple/foundationdb/bindings/go/src/fdb" library
+requires FoundationDB client libraries to be installed.
+So this is only compiled with "go build -tags foundationdb".
+*/
+package foundationdb