miscellaneous builder fixes / cleanup

[bkmartinjr]

Various builder fixes to resolve issues found during a test build:

• update to breaking changes in the Discovery REST API
• fix typos in Makefile used for manual build
• update the version used in the Docker image to match that used in package version (i.e., git describe)

[codecov]

Codecov Report

Merging #298 (0f30ba4) into main (79c6240) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #298   +/-   ##
=======================================
  Coverage   91.54%   91.54%           
=======================================
  Files          41       41           
  Lines        2260     2260           
=======================================
  Hits         2069     2069           
  Misses        191      191           

Flag	Coverage Δ
unittests	91.54% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...der/src/cell_census_builder/build_soma/manifest.py	98.61% <100.00%> (ø)
tools/cell_census_builder/tests/test_manifest.py	100.00% <100.00%> (ø)

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