Adopt release keystore verification workflow

[Copilot]

Adds a manual workflow to validate production keystore configuration before releases, adapted from trmnl-android-buddy.

Changes

• .github/workflows/test-keystore-apk-signing.yml: New workflow that:

  • Decodes keystore from KEYSTORE_BASE64 secret
  • Verifies keystore properties and alias with keytool
  • Tests jarsigner functionality
  • Builds release APK with production keystore
  • Uploads test artifacts for debugging

• keystore/README.md: Documents new workflow

Adaptations

• Keystore filename: trmnl-android-buddy-release.keystore → remote-notify-release.keystore
• Java version: 23 → 21 (matches existing workflows)
• Added Android SDK setup and EMAIL_API_KEY environment variable
• Added explicit permissions: contents: read per CodeQL recommendation

Usage

Manually trigger via Actions tab to validate keystore configuration before releases.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Adopt release key verification workflow</issue_title>
<issue_description>Adopt https://github.com/hossain-khan/trmnl-android-buddy/blob/main/.github/workflows/test-keystore-apk-signing.yml workflow for this repository.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Adopt release key verification workflow #406

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