snapcraft: Allow equal sign in commands

[3v1n0]

In various cases applications require to use --option=value syntax but this is currently blocked by snapcraft syntax checker.

So add the equal sign as a valid value in the regex since it does seems to be harmful.

See also: https://forum.snapcraft.io/t/please-allow-equals-symbol-in-snapcraft-yaml/36709

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[mr-cal]

Hi @3v1n0, I appreciate the PR but unfortunately, this can't be fixed within snapcraft.

During packaging, Snapcraft calls snap pack, which does not support equal signs in the command field (see the launchpad bug for details).

The regex preventing equal signs in Snapcraft exists for two reasons:

1. To raise the error as quickly as possible
2. To present the user with a more readable error message than the one that snap pack raises

[sergiusens]

thanks, but we cannot enable this before the feature in snapd is completed (mentioned in the forum post)