Add cache to backend and frontend build

[LeanderCS]

Fixes #77

[github-actions[bot]]

Coverage Report •

File	Stmts	Miss	Cover	Missing
TOTAL	117	24	79%

report-only-changed-files is enabled. No files were changed during this commit :)

Backend coverage

Tests	Skipped	Failures	Errors	Time
9	0 :zzz:	0 :x:	0 :fire:	0.468s :stopwatch:

[github-actions[bot]]

Frontend coverage

Tests	Skipped	Failures	Errors	Time
11	0 :zzz:	0 :x:	0 :fire:	10.095s :stopwatch:

Coverage Report • (100%)

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	100	100	100	100

report-only-changed-files is enabled. No files were changed in this commit :)