back to ubuntu-latest, remove armv7 again

Merge pull request slskd#1021 from slskd/jwt

FIX: Ensure JWT signing key is at least 32 characters (256 bits)

Merge pull request slskd#1018 from slskd/ip-pinning

Add the ability to specify a local IP address to listen on

Merge pull request slskd#986 from slskd/armv7

Stop building arm/v7 Docker images

Merge pull request slskd#984 from slskd/docs

Add docs for blacklist CIDRs

Merge pull request slskd#972 from slskd/scheduler

Add retention settings for transfers, check for 'expired' transfers on a 5 minute interval and remove (soft delete) them

Merge pull request slskd#955 from slskd/stats-username

Use current username when refreshing stats

Merge pull request slskd#951 from slskd/dl-button

Preserve file selection when fetching directory contents

Merge pull request slskd#943 from slskd/file-docs

Document remote file management option, remove delete icons from UI when option is disabled

Merge pull request slskd#907 from slskd/revert-binaries

Revert "add x86 and freebsd runtime targets"