ci: use uniform PKCS12 password for signing keystore

packageRelease failed with 'Given final block not properly padded'
because the migrated PKCS12 entry was protected with the store password,
not the key password Gradle read from key.properties. Write the PKCS12
with a single uniform password ($KEY_PASSWORD) for store and entry, and
point both storePassword and keyPassword at it.

.gitlab-ci.yml

@@ -167,30 +167,33 @@ build-apk:
     # Write local.properties for Gradle
     - echo "sdk.dir=$ANDROID_SDK_ROOT" > android/local.properties
 
-    # Decode signing keystore and migrate JKS -> PKCS12 for Gradle compatibility
+    # Decode signing keystore and migrate JKS -> PKCS12 for Gradle compatibility.
+    # PKCS12 conceptually uses one password for the store and every entry; if the
+    # store and key passwords differ, keytool protects the migrated entry with the
+    # STORE password regardless of -destkeypass, so Gradle's later read with the
+    # key password fails ("Given final block not properly padded"). Unlock the
+    # source key with its own password ($KEY_PASSWORD), then write the PKCS12 with
+    # a single uniform password ($KEY_PASSWORD) for both store and entry so the
+    # key.properties below is internally consistent.
     - echo "$ANDROID_KEYSTORE_BASE64" | base64 -d > android/app/my-upload-key.jks
-    # Pass the alias key password explicitly via -srckeypass / -destkeypass.
-    # The upload key inside the JKS has its own password ($KEY_PASSWORD) that
-    # differs from the store password ($KEYSTORE_PASSWORD); without these flags
-    # keytool prompts for it on a non-interactive runner and dies with
-    # "Too many failures - try later".
     - keytool -importkeystore
         -srckeystore android/app/my-upload-key.jks
         -destkeystore android/app/my-upload-key.keystore
         -deststoretype pkcs12
         -srcstorepass "$KEYSTORE_PASSWORD"
-        -deststorepass "$KEYSTORE_PASSWORD"
         -srcalias upload
         -destalias upload
         -srckeypass "$KEY_PASSWORD"
+        -deststorepass "$KEY_PASSWORD"
         -destkeypass "$KEY_PASSWORD"
         -noprompt
     - rm android/app/my-upload-key.jks
 
-    # Write key.properties from CI/CD variables
+    # Write key.properties from CI/CD variables. The PKCS12 above uses
+    # $KEY_PASSWORD uniformly, so both storePassword and keyPassword point to it.
     - |
       cat > android/key.properties << EOF
-      storePassword=$KEYSTORE_PASSWORD
+      storePassword=$KEY_PASSWORD
       keyPassword=$KEY_PASSWORD
       keyAlias=upload
       storeFile=my-upload-key.keystore