Cargo.toml: add cargo vendor-filterer

Copy the config from bootc.  This results in an impressive (> 50%)
amount of savings.

Signed-off-by: Allison Karlitskaya <[email protected]>

Author: allisonkarlitskaya

.gitignore

@@ -1,2 +1,3 @@
 /Cargo.lock
-/target
+/target/
+/vendor/

Cargo.toml

@@ -26,3 +26,9 @@ opt-level = 3
 [profile.profiling]
 inherits = "release"
 debug = true
+
+[workspace.metadata.vendor-filter]
+# match cargo-vendor-filterer config from bootc
+platforms = ["*-unknown-linux-gnu"]
+tier = "2"
+all-features = true