samples/tests: Limit tests to known platforms

Weekly builds will try running on a lot of platforms that aren't
necessarily supported.  Until there is better support for this, specify
an explicit list f platforms to support.

Signed-off-by: David Brown <[email protected]>

Author: d3zd3z

samples/hello_world/sample.yaml

@@ -9,6 +9,14 @@ common:
       - "Hello world from Rust on (.*)"
   tags: rust
   filter: CONFIG_RUST_SUPPORTED
+  platform_allow:
+    - qemu_cortex_m0
+    - qemu_cortex_m3
+    - qemu_riscv32
+    - qemu_riscv32/qemu_virt_riscv32/smp
+    - qemu_riscv64
+    - qemu_riscv64/qemu_virt_riscv64/smp
+    - nrf52840dk/nrf52840
 tests:
   sample.rust.helloworld:
     tags: introduction

tests/time/testcase.yaml

@@ -1,5 +1,13 @@
 common:
   filter: CONFIG_RUST_SUPPORTED
+  platform_allow:
+    - qemu_cortex_m0
+    - qemu_cortex_m3
+    - qemu_riscv32
+    - qemu_riscv32/qemu_virt_riscv32/smp
+    - qemu_riscv64
+    - qemu_riscv64/qemu_virt_riscv64/smp
+    - nrf52840dk/nrf52840
 tests:
   test.rust.time:
     harness: console