fix: disable code signing in CI and add Nextcloud sync exclusions

CI was failing because xcodebuild required a Mac Development signing
certificate on the runner. Add CODE_SIGN_IDENTITY="-" to build and test
steps in both CI and release workflows. Also add .sync-exclude.lst for
Nextcloud and exclude it from git.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: phrontizo

.github/workflows/ci.yml

@@ -40,7 +40,17 @@ jobs:
           SUMS
 
       - name: Build
-        run: xcodebuild build -scheme QuickMark -destination "platform=macOS" -quiet
+        run: >
+          xcodebuild build
+          -scheme QuickMark
+          -destination "platform=macOS"
+          CODE_SIGN_IDENTITY="-"
+          -quiet
 
       - name: Test
-        run: xcodebuild test -scheme QuickMark -destination "platform=macOS" -quiet
+        run: >
+          xcodebuild test
+          -scheme QuickMark
+          -destination "platform=macOS"
+          CODE_SIGN_IDENTITY="-"
+          -quiet

.github/workflows/release.yml

@@ -62,6 +62,7 @@ jobs:
             -destination "platform=macOS" \
             MARKETING_VERSION="$MARKETING_VERSION" \
             CURRENT_PROJECT_VERSION="$BUILD_NUMBER" \
+            CODE_SIGN_IDENTITY="-" \
             -quiet
 
       - name: Build Release

.gitignore

@@ -32,6 +32,9 @@ node_modules/
 # Python
 __pycache__/
 
+# Nextcloud sync
+.sync-exclude.lst
+
 # Local scripts
 ralph-review.py
 .ralph-memory.md