Expose build identity in version output

src/build_info.rs

@@ -0,0 +1,11 @@
+pub const VERSION: &str = env!("CARGO_PKG_VERSION");
+pub const GIT_HASH: &str = env!("DOSH_GIT_HASH");
+pub const COMMIT_DATE: &str = env!("DOSH_COMMIT_DATE");
+pub const LONG_VERSION: &str = concat!(
+    env!("CARGO_PKG_VERSION"),
+    " (",
+    env!("DOSH_GIT_HASH"),
+    ", ",
+    env!("DOSH_COMMIT_DATE"),
+    ")"
+);