ci(SundialKit): rename App Store Connect key secret to *_BASE64

Both Fastlane lanes already pass is_key_content_base64: true, but the
secret name APP_STORE_CONNECT_API_KEY_KEY was ambiguous about its
encoding. Rename to APP_STORE_CONNECT_API_KEY_KEY_BASE64 in the
workflow env blocks and Fastfile ENV reads so the contract is explicit
and a new, freshly base64-encoded secret can be added without colliding
with the old value.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: leogdion

.github/workflows/sundial-demo.yml

@@ -150,7 +150,7 @@ jobs:
           FASTLANE_KEYCHAIN_PASSWORD: ${{ steps.keychain.outputs.password }}
           APP_STORE_CONNECT_API_KEY_KEY_ID: ${{ secrets.APP_STORE_CONNECT_API_KEY_KEY_ID }}
           APP_STORE_CONNECT_API_KEY_ISSUER_ID: ${{ secrets.APP_STORE_CONNECT_API_KEY_ISSUER_ID }}
-          APP_STORE_CONNECT_API_KEY_KEY: ${{ secrets.APP_STORE_CONNECT_API_KEY_KEY }}
+          APP_STORE_CONNECT_API_KEY_KEY_BASE64: ${{ secrets.APP_STORE_CONNECT_API_KEY_KEY_BASE64 }}
           DEVELOPMENT_TEAM: ${{ secrets.DEVELOPMENT_TEAM }}
 
       - name: Upload Pulse IPA
@@ -205,7 +205,7 @@ jobs:
         env:
           APP_STORE_CONNECT_API_KEY_KEY_ID: ${{ secrets.APP_STORE_CONNECT_API_KEY_KEY_ID }}
           APP_STORE_CONNECT_API_KEY_ISSUER_ID: ${{ secrets.APP_STORE_CONNECT_API_KEY_ISSUER_ID }}
-          APP_STORE_CONNECT_API_KEY_KEY: ${{ secrets.APP_STORE_CONNECT_API_KEY_KEY }}
+          APP_STORE_CONNECT_API_KEY_KEY_BASE64: ${{ secrets.APP_STORE_CONNECT_API_KEY_KEY_BASE64 }}
 
       - name: Increment build number and commit
         if: success()

Examples/Sundial/Fastlane/Fastfile

@@ -35,7 +35,7 @@ platform :ios do
     api_key = app_store_connect_api_key(
       key_id: ENV['APP_STORE_CONNECT_API_KEY_KEY_ID'],
       issuer_id: ENV['APP_STORE_CONNECT_API_KEY_ISSUER_ID'],
-      key_content: ENV['APP_STORE_CONNECT_API_KEY_KEY'],
+      key_content: ENV['APP_STORE_CONNECT_API_KEY_KEY_BASE64'],
       is_key_content_base64: true
     )
 
@@ -113,7 +113,7 @@ platform :ios do
     api_key = app_store_connect_api_key(
       key_id: ENV['APP_STORE_CONNECT_API_KEY_KEY_ID'],
       issuer_id: ENV['APP_STORE_CONNECT_API_KEY_ISSUER_ID'],
-      key_content: ENV['APP_STORE_CONNECT_API_KEY_KEY'],
+      key_content: ENV['APP_STORE_CONNECT_API_KEY_KEY_BASE64'],
       is_key_content_base64: true
     )