Add taskchampion-sync-server-storage-postgres

This is built to be more robust than the SQLite storage, and to
integrate with other applications. The idea is that for example a web
application might interact with the same DB to create and delete clients
as customers come and go.

postgres/Cargo.toml

@@ -0,0 +1,29 @@
+[package]
+name = "taskchampion-sync-server-storage-postgres"
+version = "0.7.0-pre"
+authors = ["Dustin J. Mitchell <dustin@v.igoro.us>"]
+edition = "2021"
+description = "Postgres backend for TaskChampion-sync-server"
+homepage = "https://github.com/GothenburgBitFactory/taskchampion"
+repository = "https://github.com/GothenburgBitFactory/taskchampion-sync-server"
+license = "MIT"
+
+[dependencies]
+anyhow.workspace = true
+async-trait.workspace = true
+bb8-postgres.workspace = true
+bb8.workspace = true
+chrono.workspace = true
+env_logger.workspace = true
+log.workspace = true
+taskchampion-sync-server-core = { path = "../core", version = "0.7.0-pre" }
+thiserror.workspace = true
+tokio-postgres.workspace = true
+tokio.workspace = true
+uuid.workspace = true
+native-tls = { version = "0.2.14", features = ["vendored"] }
+postgres-native-tls = "0.5.1"
+
+[dev-dependencies]
+tempfile.workspace = true
+pretty_assertions.workspace = true