backport crdb 98422 GetConfReader freshness check - #75

control: job assigned to worker 01KX4DEW90EMZZPJ3JG0ENN4PY [factory aws, i-0738a90f72c28b3d0] (queued for 30 s)
...
task: starting task 0: "setup"
task: process exited: duration 21353 ms, exit code 0
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task: starting task 1: "authentication"
task: process exited: duration 5 ms, exit code 0
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task: starting task 2: "clone repository"
task: process exited: duration 35462 ms, exit code 0
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task: starting task 3: "build"
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| github.com/cockroachdb/cockroach/pkg/cmd/cockroach-oss
| rm -rf artifacts/cockroach
| mkdir -p artifacts/cockroach/lib
| ln ./cockroachoss artifacts/cockroach/cockroach
| ln ./cockroach-sql artifacts/cockroach/cockroach-sql
| ln lib/libgeos.so lib/libgeos_c.so artifacts/cockroach/lib/
| tar -cvf - -C artifacts cockroach | gzip -9 > cockroach.tgz
| cockroach/
| cockroach/lib/
| cockroach/lib/libgeos_c.so
| cockroach/lib/libgeos.so
| cockroach/cockroach-sql
| cockroach/cockroach
| sha256sum cockroach.tgz | awk '{ print $1 }' > cockroach.tgz.sha256
task: process exited: duration 194530 ms, exit code 0
|W| found 2 output files
|W| uploading: /work/oxidecomputer/cockroach/cockroach.tgz (92808179 bytes)
|W| uploaded: /work/oxidecomputer/cockroach/cockroach.tgz
|W| uploading: /work/oxidecomputer/cockroach/cockroach.tgz.sha256 (65 bytes)
|W| uploaded: /work/oxidecomputer/cockroach/cockroach.tgz.sha256