feat: add ignore errors flags

[anubhav06]

• Added a new --ignore-errors flag
• When this flag is used, even if we get an error while patching any of the packages, copa will still continue to produce an image.

Closes #203

How to test?

1. trivy image --vuln-type os --ignore-unfixed -f json -o nginx.1.21.6.json mcr.microsoft.com/oss/nginx/nginx:1.21.6
2. First, run copa without the --ignore-errors flag:

sudo copa patch -i mcr.microsoft.com/oss/nginx/nginx:1.21.6 -r nginx.1.21.6.json -t 1.21.6-patched

3. Now run with the --ignore-errors flag enabled:

sudo copa patch -i mcr.microsoft.com/oss/nginx/nginx:1.21.6 -r nginx.1.21.6.json -t 1.21.6-patched --ignore-errors

We can see that despite the 2 errors, copa ignores them, and still produces an image

4. Verified, that except those 2 packages, rest of the packages are patched:

[codecov]

Codecov Report

Patch coverage: 43.33% and project coverage change: +0.79% 🎉

Comparison is base (fa9ead6) 28.51% compared to head (fd99e04) 29.30%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #247      +/-   ##
==========================================
+ Coverage   28.51%   29.30%   +0.79%     
==========================================
  Files          16       16              
  Lines        1487     1498      +11     
==========================================
+ Hits          424      439      +15     
+ Misses       1037     1034       -3     
+ Partials       26       25       -1     

Files Changed	Coverage Δ
pkg/patch/patch.go	7.44% <0.00%> (ø)
pkg/pkgmgr/pkgmgr.go	12.98% <0.00%> (ø)
pkg/patch/cmd.go	53.33% <33.33%> (-0.24%)	⬇️
pkg/pkgmgr/apk.go	50.38% <57.14%> (+5.14%)	⬆️
pkg/pkgmgr/dpkg.go	33.57% <57.14%> (+0.73%)	⬆️
pkg/pkgmgr/rpm.go	33.15% <57.14%> (+0.53%)	⬆️

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[sozercan]

Thank you! LGTM