Update linux.yml

Author: DilumAluthge

.buildkite/pipelines/main/platforms/linux.yml

@@ -144,8 +144,7 @@ steps:
   - label: "tester2_rr_linux$ARCH"
     key: tester2_rr_linux$ARCH
     depends_on: package_linux$ARCH
-    # if: "$ARCH" != "32"
-    skip: true
+    skip: "$ARCH" != "32"
     plugins:
       - JuliaCI/julia#v1:
           version: 1.6