Change Dockerfile image

[Alva8756]

Currently the migration job(create tables to crdb) doesn't take effect.

Job logs only provide limit information: no migrations to run.

It's good to have shell access to either fleetdb or fleetdb-migration pod to investigate deeper. However, existing image gcr.io/distroless/static doesn't support shell :(

They do not contain package managers, shells or any other programs you would expect to find in a standard Linux distribution.
https://github.com/GoogleContainerTools/distroless/blob/main/README.md

We can revert the image back in the future. However it would be helpful for us to switch to some image that allows us debugging inside the pod.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c5d78b4) 72.72% compared to head (b1c46c6) 72.72%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #13   +/-   ##
=======================================
  Coverage   72.72%   72.72%           
=======================================
  Files          38       38           
  Lines        3732     3732           
=======================================
  Hits         2714     2714           
  Misses        760      760           
  Partials      258      258           

Flag	Coverage Δ
unittests	72.72% <ø> (ø)

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[joelrebel]

@Alva8756 should we just switch to Alpine so its similar to ConditionOrc, Flasher, Alloy ?