Ruby, Rust: add zstd compression option

rust/codeql-extractor.yml

@@ -23,10 +23,10 @@ options:
         title: Controls compression for the TRAP files written by the extractor.
         description: >
           This option is only intended for use in debugging the extractor. Accepted
-          values are 'gzip' (to write gzip-compressed TRAP) and 'none'
-          (currently the default, to write uncompressed TRAP).
+          values are 'gzip' (the default, to write gzip-compressed TRAP) 'zstd' (to
+          write Zstandard-compressed TRAP) and 'none' (to write uncompressed TRAP).
         type: string
-        pattern: "^(none|gzip)$"
+        pattern: "^(none|gzip|zstd)$"
   cargo_target_dir:
     title: Directory to use for cargo output files.
     description: >

rust/extractor/src/config.rs

@@ -29,6 +29,7 @@ pub enum Compression {
     #[default] // TODO make gzip default
     None,
     Gzip,
+    Zstd,
 }
 
 impl From<Compression> for trap::Compression {
@@ -36,6 +37,7 @@ impl From<Compression> for trap::Compression {
         match val {
             Compression::None => Self::None,
             Compression::Gzip => Self::Gzip,
+            Compression::Zstd => Self::Zstd,
         }
     }
 }

rust/ql/integration-tests/hello-project/test_project.py

@@ -20,6 +20,7 @@ def test_do_not_print_env(codeql, rust, rust_edition, cargo, check_env_not_dumpe
 @pytest.mark.ql_test("steps.ql", expected=".cargo.expected")
 @pytest.mark.parametrize(("rust_edition", "compression", "suffix"), [
     pytest.param(2024, "gzip", ".gz", id="gzip"),
+    pytest.param(2024, "zstd", ".zst", id="zstd"),
 ])
 def test_compression(codeql, rust, rust_edition, compression, suffix, cargo, rust_check_diagnostics, cwd):
     codeql.database.create(cleanup=False, _env={