chore(release): prepare public source release

.cargo/config.toml

@@ -0,0 +1,26 @@
+[build]
+target-dir = "target"
+rustc-wrapper = "sccache"
+
+[env]
+DUCKDB_DOWNLOAD_LIB = "1"
+
+[future-incompat-report]
+frequency = "always"
+
+[term]
+verbose = false
+
+[net]
+git-fetch-with-cli = true
+
+# Keep checked-in rustflags portable. For local-only CPU-specific builds, set
+# RUSTFLAGS='-Ctarget-cpu=native' in the shell instead of committing it here.
+[target.x86_64-pc-windows-msvc]
+rustflags = ["-Dwarnings"]
+
+[target.x86_64-unknown-linux-gnu]
+rustflags = ["-Dwarnings"]
+
+[target.aarch64-apple-darwin]
+rustflags = ["-Dwarnings"]