Improvements to github workflow (#4)

- format check
- clippy checks
- build tests separately before running

Also fix clippy warnings

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>

src/value.rs

@@ -137,7 +137,7 @@ impl Serialize for Value {
 impl fmt::Display for Value {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match serde_json::to_string(self) {
-            Ok(s) => write!(f, "{}", s),
+            Ok(s) => write!(f, "{s}"),
             Err(_e) => Err(std::fmt::Error),
         }
     }