fix(ci): reenable lua 5.1 testing

Author: robbielyman

build/patch.zig

@@ -17,7 +17,9 @@ pub fn main() !void {
     const patch_file = patch_file: {
         const patch_file = try std.fs.cwd().openFile(patch_file_path, .{ .mode = .read_only });
         defer patch_file.close();
-        break :patch_file try patch_file.readToEndAlloc(allocator, std.math.maxInt(usize));
+        var buf: [4096]u8 = undefined;
+        var reader = patch_file.reader(&buf);
+        break :patch_file try reader.interface.allocRemaining(allocator, .unlimited);
     };
     const chunk_details = Chunk.init(allocator, patch_file, 0) orelse @panic("No chunk data found");
 

makefile

@@ -13,8 +13,9 @@ test_zig_nightly:
 
 	zig build -Dlang=luajit
 
-# A subset of tests that are expected to work also on zig-0.14
+# A subset of tests that are expected to work also on stable builds of zig
 test_zig_stable:
+	zig build test --summary failures -Dlang=lua51
 	zig build test --summary failures -Dlang=lua52
 	zig build test --summary failures -Dlang=lua53
 	zig build test --summary failures -Dlang=lua54