Hi @nathank
Guessing here but I wonder if the error you are getting might relate to a missing space before the final slash and the final quote in the respective lines of the suggested stanza in your app.yml file?
I am inferring from the error message that your respective lines are (verbatim)
from: /-d spokes.nz/
to: “-d spokes.nz -d www.spokes.nz”
I say this, because in my case the lines are
from: /-d nzarchitecture.net.nz /
to: "-d nzarchitecture.net.nz -d www.nzarchitecture.net.nz "
And with spaces just before the end of each line as shown, I can now rebuild Discourse without throwing that error. (if you look closely you will see @pfaffman‘s updated stanza posted at start of this thread did show those extra spaces).
I have no files at all in the usr/local/bin/ directory (as noted in your error message) either, which made me suspect that lack of that letsencrypt file is not what triggers the error.
That said, for me while Discourse works ok on its url nzarchitecture.net.nz, unfortunately I still get a certificate error if typing www.nzarchitecture.net.nz into a browser - whether this is due to lack of that file, I do not know