Introduce store interface

[dominikschulz]

No description provided.

[codecov]

Codecov Report

Merging #722 into master will decrease coverage by 0.06%.
The diff coverage is 35%.

@@            Coverage Diff             @@
##           master     #722      +/-   ##
==========================================
- Coverage   62.42%   62.35%   -0.06%     
==========================================
  Files         164      164              
  Lines        8839     8835       -4     
==========================================
- Hits         5517     5509       -8     
- Misses       2673     2676       +3     
- Partials      649      650       +1

Impacted Files	Coverage Δ
pkg/store/sub/git.go	71.05% <ø> (-6.03%)	⬇️
pkg/store/root/gpg.go	0% <0%> (ø)	⬆️
pkg/cui/recipients.go	47.44% <0%> (-0.62%)	⬇️
pkg/store/root/git.go	0% <0%> (ø)	⬆️
pkg/action/sync.go	51.76% <0%> (ø)	⬆️
pkg/store/root/store.go	45% <100%> (ø)	⬆️
pkg/store/sub/store.go	54.47% <66.67%> (-0.15%)	⬇️
pkg/store/root/mount.go	55.43% <66.67%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b72a332...6199a5f. Read the comment docs.