snap-seccomp: add secondary arch for unrestricted snaps as well

[mvo5]

When creating a @unrestricted filter we need to whitelist all
architectures or e.g. i386 apps on amd64 will fail.

[zyga]

+1

Thanks for the commit message :-)

[zyga]

We could also use a test for this. I don't think we have one.

[codecov-io]

Codecov Report

Merging #3603 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #3603      +/-   ##
==========================================
- Coverage    74.9%   74.89%   -0.01%     
==========================================
  Files         380      380              
  Lines       32949    32952       +3     
==========================================
- Hits        24682    24681       -1     
- Misses       6475     6478       +3     
- Partials     1792     1793       +1

Impacted Files	Coverage Δ
cmd/snap-seccomp/main.go	49.79% <0%> (-0.64%)	⬇️
cmd/snap/cmd_aliases.go	93.33% <0%> (-1.67%)	⬇️

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[tyhicks]

This looks correct to me. Thanks!

[jdstrand]

Why this PR and #3603 (they look the same)?

This looks fine though.

[zyga]

@jdstrand because this branch is PR #3603? I suspect you meant another PR that targets the release branch though.