Updated README with Swift Package support instructions.

[rr-james-hickman]

Added instructions per request in #73

[mpdude]

Puh, it's really hard for me (as I have never used Swift) to judge this section.

My expectation was that this last line (add -scmProvider system to xcodebuild?) is all you need to know to make this action work.

I mean, isn't the rest about how to set up a private repo in the first place, something people already have when they use this action?

Also, this is only necessary when dealing with multiple deploy keys, right?

[rr-james-hickman]

I have moved and consolidated a bit. However, I personally feel like its helpful to have all the steps listed in one spot. It is not always clear what steps are all required, which is why it took 3 various articles (this documentation + an example in another issue + a StackOverflow post) before I was able to correctly get this working.

By listing here in one spot, future devs can hopefully save time on getting up and running.
Please feel free to update and commit directly to this branch though if you have a personal preference.

[mpdude]

@cerupcat I know you're using Swift with private dependenies as well. Could you help us to review this additional information for Swift users?

[cerupcat]

I plan to go through the Readme within the next couple of days and try the steps myself to confirm the same thing works for me.

[rr-james-hickman]

@cerupcat Any chance you were able to look at this yet?
cc @mpdude

[rr-james-hickman]

@mpdude @cerupcat Bump. Would love to get this closed out and off my PR list if you guys have a few minutes to verify 🙏🏼
Thanks!

[rr-james-hickman]

@mpdude @cerupcat Bumping again 🙏🏼

[mpdude]

@rr-james-hickman Thank you James for being so persistent on this one!

As I've mentioned above, I felt like the details you gave in the README for Swift were more than necessary. I was afraid of making the README hard to digest, and also afraid of having too much information in it that might get out of date and was not exactly on scope for this action.

I did, however, pick two small additions and just committed them on master, also crediting you.

What do you think – does that do it for you?

Thank you again for your energy put into this!

[rr-james-hickman]

@mpdude No worries, glad to be of service. Hopefully future devs can avoid the headaches I had when trying to get everything to work properly in this type of environment setup.