Update gem-push.yml

Address PR comments

Author: samsarkleio

.github/workflows/gem-push.yml

@@ -21,12 +21,12 @@ jobs:
         ruby-version: 2.6.x
 
     - name: Publish to RubyGems
+      env:
+        GEM_HOST_API_KEY: "${{secrets.RUBYGEMS_AUTH_TOKEN}}"
       run: |
         mkdir -p $HOME/.gem
         touch $HOME/.gem/credentials
         chmod 0600 $HOME/.gem/credentials
         printf -- "---\n:rubygems_api_key: ${GEM_HOST_API_KEY}\n" > $HOME/.gem/credentials
         gem build *.gemspec
         gem push *.gem
-      env:
-        GEM_HOST_API_KEY: "${{secrets.RUBYGEMS_AUTH_TOKEN}}"