make volume and volume mounts configurable through helm

[eljohnson92]

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[AshleyDumaine]

bit of a nit but could also do:

            {{- with .Values.volumeMounts }}
            {{- toYaml . | nindent 12 }}
            {{- end }}

same below

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.30%. Comparing base (708ee98) to head (f66c3d4).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #238      +/-   ##
==========================================
- Coverage   55.34%   55.30%   -0.04%     
==========================================
  Files          12       12              
  Lines        1881     2318     +437     
==========================================
+ Hits         1041     1282     +241     
- Misses        696      886     +190     
- Partials      144      150       +6     

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