standalone: add simple instance attestation server - #1076

control: job dependencies complete; ready to run (waiting for 12 m 55 s)
control: job assigned to worker 01KKB3M3YSE6G5AC3MM57NH1E7 [factory edgar, gimlet/BRM42220060/185] (queued for 29 m 7 s)
...
task: starting task 0: "setup"
task: process exited: duration 4082 ms, exit code 0
...
task: starting task 1: "authentication"
task: process exited: duration 68 ms, exit code 0
...
task: starting task 2: "build"
...
| a ./phd_tests::migrate::from_base::migration_from_base_and_back/migration_from_base_and_ba [...]
| a ./phd_tests::migrate::from_base::migration_from_base_and_back/migration_from_base_and_ba [...]
| a ./phd_tests::migrate::from_base::migration_from_base_and_back/migration_from_base_and_ba [...]
| + exitcode=0
| + '[' 0 -eq 0 ']'
| + echo
| 
| + echo 'ALL TESTS PASSED'
| + echo
| ALL TESTS PASSED
| 
| + find /dev/vmm -mindepth 1 -maxdepth 1
| + read
| + exit 0
task: process exited: duration 97757 ms, exit code 0
|W| found 2 output files
|W| uploading: /tmp/phd-runner.log (184375 bytes)
|W| uploaded: /tmp/phd-runner.log
|W| uploading: /tmp/phd-tmp-files.tar.gz (106153 bytes)
|W| uploaded: /tmp/phd-tmp-files.tar.gz