fix(build): do not utf8-read/write images MONGOSH-763

[rose-m]

Fixes the issue of images not showing in the MSI installer.

[addaleax]

This makes sense :)

Maybe, to avoid the filename check, we could just skip the interpolation for non-UTF-8 files? i.e.

      } else {
        const sourceText = await fs.readFile(sourceFile, 'utf8');
        if (!sourceText.contains('\ufffd')) { // This is valid UTF-8, i.e. a text file
          const interpolatedText = sourceText.replace(
            /\{\{(\w+)\}\}/g,
            (_match, identifier) => {
              if (!(identifier in interpolations)) {
                throw new Error(`Need ${identifier} for replacement in ${sourceFile}`);
              }
              return interpolations[identifier];
            });
          await fs.writeFile(targetFile, interpolatedText);
        } else {
          await fs.copyFile(sourceFile, targetFile);
        }
      }