Add configurable publishCommand

[NullVoxPopuli]

In response to feedback on #110

[rwjblue]

This still assumes a bunch of details about the command. For example, it assumes --otp, --tag, --access, and --dry-run are valid arguments to the configured publish command. I think it would probably be better to allow the customized command to include the various arguments internally instead.

I think we can use some built in functionality to release-it to easily support templating here.

It will require some additional tweaks here, but not too much AFAICT. This would become something like:

const context = {
  pathToWorkspace: workspaceInfo.relativeRoot,
  otp: otp.value,
  access,
  dryRun: this.config.isDryRun
};
let publishCommand = this.getContext().publishCommand;

if (isPNPM ) {
  // you'll need to implement the `isPNPM` conditional above, and also the default command for it; but maybe it's basically the same as the `npm publish` one but with `p` prefixed?
} else {
  publishCommand = 'npm publish <%= pathToWorkspace %> --tag <%= tag %> <%= access ? "--access " + access : "" %> <%= otp.value ? "--otp " + otp.value : "" %> <%= dryRun ? "--dry-run" : "" %>';
}

await this.exec(publishCommand, options, context);

References:

• Plugin.prototype.exec
• Shell.prototype.exec
• format util
• _.template