fix(nightly): ensure only relevant git tags are considered

Previously non-matching tags were not filtered out from the list of
valid versions. It wasn't an issue though cause all current releases do
match the pattern we were looking for. But that will not be the case for
much longer when stable releases are added into the mix.

Casks/emacs-app-nightly.rb

@@ -14,7 +14,10 @@ cask 'emacs-app-nightly' do
     url 'https://github.com/jimeh/emacs-builds.git'
     strategy :git do |tags|
       tags.map do |tag|
-        tag.gsub(/^Emacs\.(\d{4}-\d{2}-\d{2}\.\w+\.master)$/i, '\\1')
+        m = /^Emacs\.(\d{4}-\d{2}-\d{2}\.\w+\.master)$/.match(tag)
+        next unless m
+
+        m[1]
       end.compact
     end
   end
@@ -22,6 +25,7 @@ cask 'emacs-app-nightly' do
   conflicts_with(
     cask: %w[
       emacs-app
+      emacs-app-good
       emacs
       emacs-nightly
       emacs-pretest

templates/emacs-app-nightly.rb.tpl

@@ -14,7 +14,10 @@ cask 'emacs-app-nightly' do
     url 'https://github.com/jimeh/emacs-builds.git'
     strategy :git do |tags|
       tags.map do |tag|
-        tag.gsub(/^Emacs\.(\d{4}-\d{2}-\d{2}\.\w+\.master)$/i, '\\1')
+        m = /^Emacs\.(\d{4}-\d{2}-\d{2}\.\w+\.master)$/.match(tag)
+        next unless m
+
+        m[1]
       end.compact
     end
   end
@@ -22,6 +25,7 @@ cask 'emacs-app-nightly' do
   conflicts_with(
     cask: %w[
       emacs-app
+      emacs-app-good
       emacs
       emacs-nightly
       emacs-pretest