feat: regex container name filtering

[mateuszdrab]

This small change allows the use of re2 regex in the container name filter parameter

I'm currently running this in my environment with the following cmdline
--cleanup --interval 21600 -d \/[^k][^8][^s][^_][\S]+

This prevents containers belonging to K8s from being auto updated as there is no way to enforce labels correctly in K8s.

I've been running this since end of January and had no problems so far - thought it would be nice to PR this.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[mateuszdrab]

Should we merge it or leave it?

[simskij]

Sorry Mateusz, I've been preoccupied with other things for a while. Will have a look as soon as time allows. Thank you for your contribution. 🙏🏼

[codecov]

Codecov Report

Merging #1241 (c14d6df) into main (70ca4c2) will increase coverage by 1.84%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1241      +/-   ##
==========================================
+ Coverage   62.70%   64.55%   +1.84%     
==========================================
  Files          23       23              
  Lines        1488     1560      +72     
==========================================
+ Hits          933     1007      +74     
+ Misses        471      464       -7     
- Partials       84       89       +5     

Impacted Files	Coverage Δ
pkg/filters/filters.go	88.88% <100.00%> (+7.63%)	⬆️
internal/actions/update.go	63.07% <0.00%> (-6.03%)	⬇️
pkg/notifications/slack.go	95.12% <0.00%> (+0.25%)	⬆️
pkg/notifications/shoutrrr.go	74.69% <0.00%> (+0.30%)	⬆️
internal/flags/flags.go	89.60% <0.00%> (+0.95%)	⬆️
pkg/container/client.go	30.80% <0.00%> (+2.88%)	⬆️
pkg/notifications/notifier.go	84.93% <0.00%> (+7.57%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us.

[piksel]

Soo, to make this change backwards-compatible, we need to ensure that the whole name matches the regex, otherwise we would have containers which included the name as a substring match.
I added some tests to confirm this, and replaced the regexp.MatchStrings with *Regex.FindStringIndex and verifying the match indices.
Since the initial / is optional, the match needs to start at 0 or 1.

[piksel]

I have handled the scenarios that I was worried about. @simskij ?

[mateuszdrab]

@piksel

Thanks for merging

Quick question, will there be a release any time soon?

If not, I'm happy to use the dev builds in the meantime; however, those are only built for amd64 - any chance to have cross platform dev builds?

Thanks

[piksel]

@mateuszdrab What platform do you need? arm64? If it's not giving me too much trouble it would of course be better to just do a multi-platform image, but otherwise I could just add a platform specific tag.

I have been piling up work for some time, so I can't give you a release date unfortunately.

[mateuszdrab]

@mateuszdrab What platform do you need? arm64? If it's not giving me too much trouble it would of course be better to just do a multi-platform image, but otherwise I could just add a platform specific tag.

I have been piling up work for some time, so I can't give you a release date unfortunately.

@piksel
armv7 actually, haven't switched the Raspberry Pis to 64 bit yet since its a mixture of 2s, 3s and a 4.