Remove LMDB from the default features

.github/workflows/ci.yml

@@ -59,6 +59,9 @@ jobs:
       - name: Test with db-int-key
         run: cargo test --lib --no-default-features --features "db-int-key" --verbose
 
+      - name: Test with LMDB enabled
+        run: cargo test --all --features "lmdb" --verbose
+
       - name: Test in release mode
         run: cargo test --release --all --verbose
 

Cargo.toml

@@ -44,7 +44,7 @@ required-features = ["lmdb"]
 lmdb = ["lmdb-rkv"]
 db-dup-sort = []
 db-int-key = []
-default = ["db-dup-sort", "db-int-key", "lmdb"]
+default = ["db-dup-sort", "db-int-key"]
 no-canonicalize-path = []
 with-asan = ["lmdb", "lmdb-rkv/with-asan"]
 with-fuzzer = ["lmdb", "lmdb-rkv/with-fuzzer"]