Refactor

[crazy-max]

• Refactor to start working on Parallel downloads #48
• Switch to Docker actions
• Update GOPROXY setting

[codecov]

Codecov Report

Merging #125 into master will decrease coverage by 5.46%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #125      +/-   ##
==========================================
- Coverage   68.57%   63.10%   -5.47%     
==========================================
  Files           2       10       +8     
  Lines          70      103      +33     
==========================================
+ Hits           48       65      +17     
- Misses         10       27      +17     
+ Partials       12       11       -1     

Impacted Files	Coverage Δ
internal/config/db.go	100.00% <ø> (ø)
internal/config/download.go	70.00% <ø> (ø)
internal/config/notif.go	0.00% <ø> (ø)
internal/config/notif_mail.go	57.14% <ø> (ø)
internal/config/notif_slack.go	0.00% <ø> (ø)
internal/config/notif_webhook.go	40.00% <ø> (ø)
internal/config/server.go	0.00% <ø> (ø)
internal/config/server_ftp.go	70.00% <ø> (ø)
internal/config/server_sftp.go	57.14% <ø> (ø)
internal/config/config.go	64.91% <100.00%> (+0.62%)	⬆️
... and 9 more

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