Add descriptions back to workflow_call secret declarations

We removed these when I thouht we could just read environmental secrets
without having these defined at the top, but it turns out we do need
them defined, so we'll leave the doc here with the additional details
in the docs/flutter.md file. We don't need the vars defined as inputs
though, I believe.

Author: elasticdog

.github/workflows/draft-release-flutter.yml

@@ -32,22 +32,42 @@ on:
         default: upload
     secrets:
       ANDROID_APP_SIGNING_KEYSTORE_B64:
-        required: false
+        description: >
+          Base64-encoded Android app signing keystore (PKCS12 or JKS) used by
+          Gradle to sign release APKs in CI.
+        required: true
       ANDROID_APP_SIGNING_KEYSTORE_PASSWORD:
-        required: false
+        description: >
+          Password protecting the Android app signing keystore file.
+        required: true
       ANDROID_APP_SIGNING_KEY_PASSWORD:
-        required: false
+        description: >
+          Password for the app signing key alias within the Android keystore.
+        required: true
       ANDROID_UPLOAD_KEYSTORE_B64:
+        description: >
+          Base64-encoded Android upload keystore (PKCS12 or JKS) used by
+          Gradle to sign release App Bundles in CI.
         required: false
       ANDROID_UPLOAD_KEYSTORE_PASSWORD:
+        description: >
+          Password protecting the Android upload keystore file.
         required: false
       ANDROID_UPLOAD_KEY_PASSWORD:
+        description: >
+          Password for the upload key alias within the Android keystore.
         required: false
       IOS_SIGNING_CERT_B64:
+        description: >
+          Base64-encoded iOS distribution signing certificate (P12) used for App Store builds.
         required: false
       IOS_SIGNING_CERT_PASSWORD:
+        description: >
+          Password protecting the iOS signing certificate.
         required: false
       IOS_PROVISIONING_PROFILE_B64:
+        description: >
+          Base64-encoded iOS provisioning profile for App Store builds.
         required: false
 
 permissions:

.github/workflows/upload-build-ios.yml

@@ -9,6 +9,8 @@ on:
         type: string
     secrets:
       ASC_AUTH_KEY_B64:
+        description: >
+          Base64-encoded AuthKey file (.p8) used for App Store Connect API JWT authentication.
         required: false
 
 jobs: