ci: test ReleaseFast builds (#8)

* ci: test ReleaseFast builds

* ci: address ReleaseFast review

---------

Co-authored-by: 5t4rg4z3r <314316247+5t4rg4z3r@users.noreply.github.com>

Author: 5t4rg4z3r

.github/workflows/ci.yml

@@ -43,3 +43,9 @@ jobs:
 
       - name: zig build test (Release Safe)
         run: zig build test --release=safe
+
+      - name: zig build (Release Fast)
+        run: zig build --release=fast
+
+      - name: zig build test (Release Fast)
+        run: zig build test --release=fast