ci: put CI keychain first in codesign search list

codesign resolves signing identities through the user keychain search
list (first match wins) and ignores --keychain for the lookup. This
runner hosts another project whose keychain holds the same Apple
Distribution identity, so when that keychain is locked, codesign fails
with errSecInternalComponent no matter how correctly our own keychain
is set up. Prepend the fresh CI keychain to the search list for the
build and always delete it afterward, which restores the original list.

Also drop the runner-diagnostics step, the GitHub-hosted Ruby PATH
export, and the duplicate CODE_SIGN_IDENTITY param.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitea/workflows/testflight.yml

@@ -9,15 +9,10 @@ on:
 jobs:
   testflight:
     runs-on: macos-arm64
-    defaults:
-      run:
-        shell: bash
 
     steps:
       - name: Checkout
         uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
 
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
@@ -27,19 +22,7 @@ jobs:
           working-directory: ios
 
       - name: Install XcodeGen
-        run: |
+        run: command -v xcodegen >/dev/null 2>&1 || brew install xcodegen
-          set -euo pipefail
-          if ! command -v xcodegen >/dev/null 2>&1; then
-            brew install xcodegen
-          fi
-
-      - name: Runner diagnostics
-        run: |
-          set -euo pipefail
-          whoami
-          printf 'HOME=%s\n' "$HOME"
-          security default-keychain -d user || true
-          security list-keychains -d user || true
 
       - name: Upload to TestFlight
         working-directory: ios
@@ -53,7 +36,4 @@ jobs:
           SYBIL_BUILD_NUMBER: ${{ github.run_number }}
           FASTLANE_SKIP_UPDATE_CHECK: "1"
           FASTLANE_XCODEBUILD_SETTINGS_TIMEOUT: "120"
-        run: |
+        run: bundle exec fastlane ios beta
-          export PATH="/Users/runner/hostedtoolcache/Ruby/3.1.7/arm64/bin:${PATH}"
-          ruby --version
-          bundle exec fastlane ios beta

ios/fastlane/Fastfile

@@ -6,6 +6,9 @@ APP_IDENTIFIER = "net.buzzert.sybil2"
 SCHEME = "Sybil"
 TEAM_ID = "DQQH5H6GBD"
 PROFILE_NAME = "Sybil AppStore CI"
+CI_KEYCHAIN_NAME = "sybil_ci_keychain"
+CI_KEYCHAIN_PASSWORD = "sybil-ci-keychain-password"
+CI_KEYCHAIN_DB_PATH = File.expand_path("~/Library/Keychains/#{CI_KEYCHAIN_NAME}-db")
 IOS_ROOT = File.expand_path("..", __dir__)
 PROJECT_FILE = File.join(IOS_ROOT, "Sybil.xcodeproj")
 PROJECT_SPEC = File.join(IOS_ROOT, "project.yml")
@@ -68,20 +71,33 @@ platform :ios do
     )
   end
 
-  # CI uses a throwaway keychain that is deleted after the lane exits.
+  # CI signs headlessly, so match needs a fresh unlocked keychain to import
+  # into. codesign resolves identities through the user keychain *search list*
+  # (first match wins; the --keychain flag does not restrict the lookup), and
+  # other projects' keychains on this runner hold the same identity but are
+  # usually locked — so ours must come first. delete_keychain in the beta
+  # lane's ensure removes both the keychain and its search-list entry, which
+  # also keeps our (later locked) copy from shadowing those other projects.
   private_lane :prepare_ci_keychain do
-    next nil unless ci?
+    next unless ci?
 
-    run_token = "#{Time.now.to_i}_#{Process.pid}"
+    delete_keychain(name: CI_KEYCHAIN_NAME) if File.file?(CI_KEYCHAIN_DB_PATH)
-    keychain_name = "fastlane_ci_#{run_token}"
+    create_keychain(
-
+      name: CI_KEYCHAIN_NAME,
-    setup_ci(
+      password: CI_KEYCHAIN_PASSWORD,
-      force: true,
+      unlock: true,
-      keychain_name: keychain_name,
+      timeout: 3600,
-      timeout: 7_200
+      add_to_search_list: false
     )
 
-    keychain_name
+    others = sh("security list-keychains -d user", log: false)
+      .scan(/"([^"]+)"/)
+      .flatten
+      .reject { |path| path.include?(CI_KEYCHAIN_NAME) }
+    sh("security list-keychains -d user -s #{([CI_KEYCHAIN_DB_PATH] + others).shelljoin}")
+
+    ENV["MATCH_KEYCHAIN_NAME"] = CI_KEYCHAIN_NAME
+    ENV["MATCH_KEYCHAIN_PASSWORD"] = CI_KEYCHAIN_PASSWORD
   end
 
   private_lane :sync_signing do |options|
@@ -106,10 +122,7 @@ platform :ios do
 
   desc "Build and upload to TestFlight"
   lane :beta do
-    ci_keychain_name = nil
+    prepare_ci_keychain
-
-    begin
-      ci_keychain_name = prepare_ci_keychain
 
     api_key = app_store_api_key
 
@@ -122,13 +135,10 @@ platform :ios do
 
     sync_signing(api_key: api_key, readonly: true)
 
-      sh("security find-identity -v -p codesigning") if ci_keychain_name
-
     build_app(
       project: PROJECT_FILE,
       scheme: SCHEME,
       export_method: "app-store",
-        codesigning_identity: "Apple Distribution",
       xcargs: [
         "DEVELOPMENT_TEAM=#{TEAM_ID.shellescape}",
         "CODE_SIGN_STYLE=Manual",
@@ -149,7 +159,6 @@ platform :ios do
       skip_waiting_for_build_processing: true
     )
   ensure
-      delete_keychain(name: ci_keychain_name) if ci_keychain_name
+    delete_keychain(name: CI_KEYCHAIN_NAME) if ci? && File.file?(CI_KEYCHAIN_DB_PATH)
-    end
   end
 end