chore(ci): simplify build command to use default configuration

Remove explicit -Doptimize=ReleaseSafe and -Dtarget=aarch64-linux-gnu
from the CI build step. Using the default zig build command allows
the CI to produce debug builds which compile faster and are sufficient
for validating that the codebase compiles correctly on all platforms.

Author: lispking

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
           version: '0.16.0'
 
       - name: Build
-        run: zig build -Doptimize=ReleaseSafe -Dtarget=aarch64-linux-gnu
+        run: zig build
         shell: bash
 
       - name: Run tests