Only test macOS in BCR presubmit

.bcr/presubmit.yml

@@ -1,24 +1,7 @@
-shell_commands: &shell_commands
-- "echo --- Downloading and extracting Swift $SWIFT_VERSION to $SWIFT_HOME"
-- "mkdir $SWIFT_HOME"
-- "curl https://download.swift.org/swift-${SWIFT_VERSION}-release/ubuntu2004/swift-${SWIFT_VERSION}-RELEASE/swift-${SWIFT_VERSION}-RELEASE-ubuntu20.04.tar.gz | tar xvz --strip-components=1 -C $SWIFT_HOME"
-
 tasks:
-  verify_targets_linux:
-    name: Verify targets (Linux)
-    platform: ubuntu2004
-    environment:
-      CC: "clang"
-      SWIFT_VERSION: "5.10"
-      SWIFT_HOME: "$HOME/swift-$SWIFT_VERSION"
-      PATH: "$PATH:$SWIFT_HOME/usr/bin"
-    shell_commands: *shell_commands
-    build_flags:
-      - "--action_env=PATH"
-    build_targets:
-      - '@yams//:Yams'
-  verify_targets_macos:
-    name: Verify targets (macOS)
+  verify_targets:
+    name: Verify build targets
     platform: macos
+    bazel: 7.x
     build_targets:
       - '@yams//:Yams'