GitLab: Run sandbox on fast amd64 and fast arm64 hosts

Now that we can run sandbox on arm64 hosts, have these jobs run on both
the fast arm64 and amd64 hosts to catch any issues.

Signed-off-by: Tom Rini <trini@konsulko.com>

.gitlab-ci.yml

@@ -230,31 +230,47 @@ Check packing of Python tools:
 
 # Test sandbox with test.py
 sandbox test.py:
+  parallel:
+    matrix:
+      - HOST: "fast arm64"
+      - HOST: "fast amd64"
   tags:
-    - ${DEFAULT_AMD64_TAG}
+    - ${HOST}
   variables:
     TEST_PY_BD: "sandbox"
     TEST_PY_EXTRA: "--timing"
   <<: *buildman_and_testpy_dfn
 
 sandbox with clang test.py:
+  parallel:
+    matrix:
+      - HOST: "fast arm64"
+      - HOST: "fast amd64"
   tags:
-    - ${DEFAULT_AMD64_TAG}
+    - ${HOST}
   variables:
     TEST_PY_BD: "sandbox"
     OVERRIDE: "-O clang-17"
   <<: *buildman_and_testpy_dfn
 
 sandbox64 test.py:
+  parallel:
+    matrix:
+      - HOST: "fast arm64"
+      - HOST: "fast amd64"
   tags:
-    - ${DEFAULT_AMD64_TAG}
+    - ${HOST}
   variables:
     TEST_PY_BD: "sandbox64"
   <<: *buildman_and_testpy_dfn
 
 sandbox64 with clang test.py:
+  parallel:
+    matrix:
+      - HOST: "fast arm64"
+      - HOST: "fast amd64"
   tags:
-    - ${DEFAULT_AMD64_TAG}
+    - ${HOST}
   variables:
     TEST_PY_BD: "sandbox64"
     OVERRIDE: "-O clang-17"