remove atty - #1180

control: job assigned to worker 01KY5BQSRVESPTSX6PHW631V88 [factory aws, i-0cf4e0702cd499955] (queued for 43 s)
...
task: starting task 0: "setup"
task: process exited: duration 4080 ms, exit code 0
...
task: starting task 1: "rust-toolchain"
task: process exited: duration 16471 ms, exit code 0
...
task: starting task 2: "authentication"
task: process exited: duration 15 ms, exit code 0
...
task: starting task 3: "clone repository"
task: process exited: duration 1398 ms, exit code 0
...
task: starting task 4: "build"
...
| slp   1:55:14.890419611
| lat      2:14.984175507
| stop     3:28.249087950
| + OUTDIR=/work/release
| + mkdir -p /work/release
| + cp target/release/propolis-cli /work/release/propolis-cli
| + cp target/release/propolis-server /work/release/propolis-server
| + cd /work/release
| + digest -a sha256 propolis-cli
| + digest -a sha256 propolis-server
task: process exited: duration 538284 ms, exit code 0
|W| found 4 output files
|W| uploading: /work/release/propolis-cli (25434568 bytes)
|W| uploaded: /work/release/propolis-cli
|W| uploading: /work/release/propolis-cli.sha256.txt (65 bytes)
|W| uploaded: /work/release/propolis-cli.sha256.txt
|W| uploading: /work/release/propolis-server (81806376 bytes)
|W| uploaded: /work/release/propolis-server
|W| uploading: /work/release/propolis-server.sha256.txt (65 bytes)
|W| uploaded: /work/release/propolis-server.sha256.txt