Merge branch 'tim/cross_build_library' into 'master'

ci: Cross-build sdk-rust library in CI, even if we can't run tests

See merge request TankerHQ/sdk-rust!46

Author: tux3

run-ci.py

@@ -197,6 +197,9 @@ def prepare(self, update: bool, tanker_ref: Optional[str] = None) -> None:
 
     def test(self) -> None:
         if not self._is_host_target():
+            tankerci.run(
+                "cargo", "build", "--target", self.target_triplet, cwd=self.src_path
+            )
             ui.info(self.profile, "is a cross-compiled target, skipping tests")
             return
         tankerci.run("cargo", "fmt", "--", "--check", cwd=self.src_path)