WIP ci: Enable native ARM64 jobs

Author: real-or-random

.cirrus.yml

@@ -168,13 +168,12 @@ task:
 
 task:
   name: "ARM32: Linux (Debian stable, QEMU)"
-  container:
+  arm_container:
     << : *LINUX_CONTAINER
   env:
-    WRAPPER_CMD: qemu-arm
-    SECP256K1_TEST_ITERS: 16
     HOST: arm-linux-gnueabihf
     WITH_VALGRIND: no
+    WIDEMUL: int64
     ECDH: yes
     RECOVERY: yes
     SCHNORRSIG: yes
@@ -190,11 +189,9 @@ task:
 
 task:
   name: "ARM64: Linux (Debian stable, QEMU)"
-  container:
+  arm_container:
     << : *LINUX_CONTAINER
   env:
-    WRAPPER_CMD: qemu-aarch64
-    SECP256K1_TEST_ITERS: 16
     HOST: aarch64-linux-gnu
     WITH_VALGRIND: no
     ECDH: yes