Add ci_src_must_match support

Summary:
`ci_src_must_match` is an attribute of custom workflows which contains a list of globs and requires any of the changed files to match any of the globs in order for the target to be considered for selection.
This is basically an intersection functionality in UTD terms, and it's widely requested by the owners of resource-constrained or specialized custom workflows.

Reviewed By: Acesine

Differential Revision: D65802534

fbshipit-source-id: 34fa861f88f100209e9683fdd2a3f17308372721

btd/src/buck/targets.rs

@@ -176,6 +176,9 @@ pub struct BuckTarget {
     pub ci_srcs: Box<[Glob]>,
     /// Used as additional triggers
     #[serde(default, skip_serializing_if = "is_empty_slice")]
+    pub ci_srcs_must_match: Box<[Glob]>,
+    /// Used as additional triggers
+    #[serde(default, skip_serializing_if = "is_empty_slice")]
     pub ci_deps: Box<[TargetPattern]>,
 }
 
@@ -205,6 +208,7 @@ impl BuckTarget {
             labels: Labels::default(),
             oncall: None,
             ci_srcs: Box::new([]),
+            ci_srcs_must_match: Box::new([]),
             ci_deps: Box::new([]),
         }
     }