add tokio_unstable cfg in Cargo.toml and GH actions

Author: sivukhin

.github/workflows/nemesis.yml

@@ -18,7 +18,7 @@ jobs:
     if: github.repository == 'tursodatabase/libsql'
     name: Run Nemesis Tests
     env:
-      RUSTFLAGS: -D warnings
+      RUSTFLAGS: -D warnings --cfg tokio_unstable
     steps:
       - uses: hecrj/setup-rust-action@v2
 

.github/workflows/rust.yml

@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Run Checks
     env:
-      RUSTFLAGS: -D warnings
+      RUSTFLAGS: -D warnings --cfg tokio_unstable
     steps:
       - uses: hecrj/setup-rust-action@v2
 
@@ -80,15 +80,15 @@ jobs:
       - uses: taiki-e/install-action@cargo-udeps
       - uses: Swatinem/rust-cache@v2
       - run: cargo +nightly hack udeps -p libsql --each-feature
-      - run: RUSTFLAGS="-D warnings" cargo check -p libsql --no-default-features --features core 
-      - run: RUSTFLAGS="-D warnings" cargo check -p libsql --no-default-features --features replication 
-      - run: RUSTFLAGS="-D warnings" cargo check -p libsql --no-default-features --features remote
+      - run: RUSTFLAGS="-D warnings --cfg tokio_unstable" cargo check -p libsql --no-default-features --features core 
+      - run: RUSTFLAGS="-D warnings --cfg tokio_unstable" cargo check -p libsql --no-default-features --features replication 
+      - run: RUSTFLAGS="-D warnings --cfg tokio_unstable" cargo check -p libsql --no-default-features --features remote
 
   test:
     runs-on: ubuntu-latest
     name: Run Tests
     env:
-      RUSTFLAGS: -D warnings
+      RUSTFLAGS: -D warnings --cfg tokio_unstable
     steps:
     - uses: hecrj/setup-rust-action@v2
 

libsql-server/Cargo.toml

@@ -8,6 +8,9 @@ default-run = "sqld"
 name = "sqld"
 path = "src/main.rs"
 
+[build]
+rustflags = ["--cfg", "tokio_unstable"]
+
 [dependencies]
 anyhow = "1.0.66"
 async-lock = "2.6.0"
@@ -116,6 +119,7 @@ vergen = { version = "8", features = ["build", "git", "gitcl"] }
 
 [features]
 default = []
+tokio-metrics = []
 debug-tools = ["console-subscriber", "rusqlite/trace", "tokio/tracing"]
 wasm-udfs = ["rusqlite/libsql-wasm-experimental"]
 unix-excl-vfs = ["libsql-sys/unix-excl-vfs"]