fix(quickget): skip unsupported architectures for test/show operations

- If architecture is unsupported and OPERATION is "test" or "show",
  call test_result with SKIP and exit 0
- Keep existing error and exit 1 for non-test/show operations

Signed-off-by: Martin Wimpress <martin@wimpress.org>

quickget

@@ -4108,9 +4108,14 @@ if [ -n "${2}" ]; then
         fi
         # Now that EDITION is known, validate architecture support
         if ! is_arch_supported "${OS}" "${ARCH}"; then
+            if [ "${OPERATION}" == "test" ] || [ "${OPERATION}" == "show" ]; then
+                test_result "${OS}" "${RELEASE}" "${EDITION}" "" "SKIP" "(not available for ${ARCH})"
+                exit 0
+            else
                 echo "ERROR! $(pretty_name "${OS}") ${EDITION} is not available for ${ARCH} architecture."
                 exit 1
             fi
+        fi
         handle_missing
         VM_PATH="${OS}-${RELEASE}-${EDITION}"
         create_vm "$("get_${OS}" "${EDITION}")"