ci: circumvent AVX512 issue on GHA runners (#87)

Author: Ahajha

.bazelrc

@@ -6,3 +6,8 @@ info --platforms=@platforms//host
 
 common --platforms=@mojo_host_platform
 common --host_platform=@mojo_host_platform
+
+# HACK: Github Action runners using AMD EPYC CPUs have AVX512 disabled.
+# Mojo will happily generate those instructions, but then they crash at runtime.
+# Totally disable AVX512 to circumvent the issue.
+common:ci --//:mojo_copt=--target-features=-avx512f,-avx512bw,-avx512cd,-avx512dq,-avx512vl,-avx512ifma,-avx512vbmi,-avx512vbmi2,-avx512vnni,-avx512bitalg,-avx512vpopcntdq,-avx512fp16,-avx512bf16

.github/workflows/ci.yaml

@@ -32,4 +32,7 @@ jobs:
         run: |
           bazel version
           bazel info
-      - run: bazel test //...
+      - name: CPU Info
+        run: |
+          lscpu || true
+      - run: bazel test --config=ci //...