Timheuer Copilot Instructions IOS Cicd Github Actions

iOS CI/CD with GitHub Actions (Build, Sign, Upload)

This skill helps design, implement, and debug a framework-agnostic iOS CI/CD pipeline using GitHub Actions. It focuses on the essential Apple requirements: build environment, signing, provisioning, archiving, and TestFlight upload.

What “done” looks like

A GitHub Actions workflow that:

1. Uses a pinned macOS runner
2. Uses a pinned Xcode version
3. Imports an Apple Distribution certificate into a temporary keychain
4. Downloads App Store provisioning profiles using App Store Connect API keys
5. Builds a Release archive and exports an IPA
6. Uploads the IPA to TestFlight

Canonical CI/CD order (do not reorder)

1. Pin the build environment

• Explicit runs-on (never macos-latest)
• Explicit Xcode version
• Set a job timeout

2. Checkout source

• Use actions/checkout
• Enable submodules if required

3. Install build dependencies

• Language SDKs, CLIs, package managers
• Restore dependencies deterministically (lockfiles)

4. Import signing certificate

• Use an Apple Distribution .p12
• Import into a temporary keychain
• Never store raw certificates in the repo

5. Download provisioning profiles

• Use App Store Connect API key authentication
• Match bundle identifier exactly
• Use IOS_APP_STORE profile type for TestFlight

6. Build, archive, export IPA

• Build in Release
• Produce an .ipa suitable for App Store distribution
• Export to a predictable path

7. Upload to TestFlight

• Authenticate with the same App Store Connect API key
• Ensure build number is valid and incremented

Required GitHub Secrets

Apple Distribution Certificate

• APPSTORE_CERTIFICATE_P12 – base64-encoded .p12
• APPSTORE_CERTIFICATE_P12_PASSWORD – password for the .p12

App Store Connect API

• APPSTORE_ISSUER_ID
• APPSTORE_KEY_ID
• APPSTORE_PRIVATE_KEY – contents of the .p8 file

App Metadata

• IOS_BUNDLE_ID – e.g. com.example.myapp

Minimal Framework-Agnostic Workflow Template

Replace the build step with your own build system. Your build must produce an IPA at the specified path.

name: iOS CI

on:
  workflow_dispatch:
  push:
    branches: [ main ]

jobs:
  ios:
    runs-on: macos-15
    timeout-minutes: 45

    env:
      IOS_BUNDLE_ID: ${{ secrets.IOS_BUNDLE_ID }}

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Select Xcode
        uses: maxim-lobanov/setup-xcode@v1
        with:
          xcode-version: "16.3"

      - name: Import Apple Distribution Certificate
        uses: apple-actions/import-codesign-certs@v4
        with:
          create-keychain: true
          keychain-password: ${{ secrets.APPSTORE_CERTIFICATE_P12_PASSWORD }}
          p12-file-base64: ${{ secrets.APPSTORE_CERTIFICATE_P12 }}
          p12-password: ${{ secrets.APPSTORE_CERTIFICATE_P12_PASSWORD }}

      - name: Download Provisioning Profile
        uses: apple-actions/download-provisioning-profiles@v4
        with:
          bundle-id: ${{ env.IOS_BUNDLE_ID }}
          profile-type: IOS_APP_STORE
          issuer-id: ${{ secrets.APPSTORE_ISSUER_ID }}
          api-key-id: ${{ secrets.APPSTORE_KEY_ID }}
          api-private-key: ${{ secrets.APPSTORE_PRIVATE_KEY }}

      - name: Build, Archive, Export IPA
        shell: bash
        run: |
          set -euo pipefail
          echo "Run your build system here"
          echo "Ensure an IPA is written to artifacts/MyApp.ipa"
          mkdir -p artifacts

      - name: Upload to TestFlight
        uses: apple-actions/upload-testflight-build@v1
        with:
          app-type: ios
          app-path: artifacts/MyApp.ipa
          issuer-id: ${{ secrets.APPSTORE_ISSUER_ID }}
          api-key-id: ${{ secrets.APPSTORE_KEY_ID }}
          api-private-key: ${{ secrets.APPSTORE_PRIVATE_KEY }}

Debugging Playbook

Identify the failure stage first:

1. Runner / Xcode

   • Wrong Xcode version
   • Toolchain not available

2. Certificate Import

   • Invalid base64 encoding
   • Wrong .p12 password
   • Missing private key

3. Provisioning

   • Bundle ID mismatch
   • API key lacks App Manager permissions
   • Wrong profile type

4. Build Signing

   • Team ID mismatch
   • Entitlements mismatch
   • Signing identity not found in keychain

5. IPA Export

   • Archive created but IPA missing
   • Export method incorrect

6. TestFlight Upload

   • Build number reuse
   • API key scope issues
   • Missing compliance metadata

Always request:

• Bundle ID
• Distribution target (TestFlight vs App Store)
• Failing log lines
• IPA output path

Skill Behavior Expectations

When this skill is active:

• Produce copy‑pasteable workflows
• Prefer explicit versions and secret names
• Avoid framework‑specific assumptions
• Optimize for repeatability and security

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