[OSS Fuzz] Building Lua tests on aarch64 is broken

[ligurio]

Full log: https://oss-fuzz-build-logs.storage.googleapis.com/log-6d6db990-9cf1-4c9d-b2a2-9504a17e0d21.txt

<snipped>
Step #60: Already have image: gcr.io/oss-fuzz/lua
Finished Step #60
Starting Step #61 - "compile-libfuzzer-address-aarch64"
Step #61 - "compile-libfuzzer-address-aarch64": Already have image (with digest): gcr.io/cloud-builders/docker
Step #61 - "compile-libfuzzer-address-aarch64": exec /usr/bin/bash: exec format error
Finished Step #61 - "compile-libfuzzer-address-aarch64"
<snipped>

OSS Fuzz issue: google/oss-fuzz#12670