Add API key content environment var

This is required to run fastlane's release process.

Author: cwbooth5

.github/workflows/publish-release.yml

@@ -146,4 +146,5 @@ jobs:
         env:
           APP_STORE_CONNECT_API_KEY_ID: ${{ secrets.APP_STORE_CONNECT_API_KEY_ID }}
           APP_STORE_CONNECT_ISSUER_ID: ${{ secrets.APP_STORE_CONNECT_ISSUER_ID }}
+          APP_STORE_CONNECT_API_KEY_CONTENT: ${{ secrets.APP_STORE_CONNECT_API_KEY_CONTENT }}
         run: bundle exec fastlane deploy