shell: exec encoding is utf8 by default and no shell

explicitly mark calls that require the shell

src/apps.js

@@ -2832,7 +2832,7 @@ async function uploadFile(app, sourceFilePath, destFilePath) {
 
     // the built-in bash printf understands "%q" but not /usr/bin/printf.
     // ' gets replaced with '\'' . the first closes the quote and last one starts a new one
-    const escapedDestFilePath = await shell.promises.exec('uploadFile', `printf %q '${destFilePath.replace(/'/g, '\'\\\'\'')}'`, { shell: '/bin/bash', encoding: 'utf8' });
+    const escapedDestFilePath = await shell.promises.exec('uploadFile', `printf %q '${destFilePath.replace(/'/g, '\'\\\'\'')}'`, { shell: '/bin/bash' });
     debug(`uploadFile: ${sourceFilePath} -> ${escapedDestFilePath}`);
 
     const execId = await createExec(app, { cmd: [ 'bash', '-c', `cat - > ${escapedDestFilePath}` ], tty: false });