ci: use fast macos runners from bladerunner

.github/workflows/build-ios.yml

@@ -10,7 +10,7 @@ on:
 jobs:
   build-ios:
     name: Build iOS Simulator App
-    runs-on: macos-15
+    runs-on: bladerunner-macos 
 
     steps:
       - name: Checkout repository
@@ -31,15 +31,6 @@ jobs:
           brew install nim
           echo "$HOME/.nimble/bin" >> $GITHUB_PATH
 
-      - name: Setup Ruby
-        uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: '3.0'
-          working-directory: mobile-app/ios
-
-      - name: Select Xcode 16.4
-        run: sudo xcode-select -s "/Applications/Xcode_16.4.app/Contents/Developer"
-
       - name: Build iOS
         working-directory: mobile-app
         run: make build-ios

.github/workflows/nix-build.yml

@@ -22,20 +22,14 @@ jobs:
           extra_nix_config: |
             experimental-features = nix-command flakes
 
-      - name: Cache Nix store
-        uses: cachix/cachix-action@v15
-        with:
-          name: devenv
-          skipPush: true
-
       - name: Init git repo (required by nimble)
         working-directory: mobile-app
         run: |
           git init
           git config user.email "ci@test.com"
           git config user.name "CI"
           git add -A
-          git commit -m "init"
+          git diff --cached --quiet || git commit -m "init"
 
       - name: Build Android via Nix + Make
         run: nix develop --command bash -c 'make android'
@@ -49,7 +43,7 @@ jobs:
 
   nix-ios:
     name: Nix → iOS Build
-    runs-on: macos-15
+    runs-on: bladerunner-macos
 
     steps:
       - name: Checkout repository
@@ -61,23 +55,14 @@ jobs:
           extra_nix_config: |
             experimental-features = nix-command flakes
 
-      - name: Cache Nix store
-        uses: cachix/cachix-action@v15
-        with:
-          name: devenv
-          skipPush: true
-
-      - name: Select Xcode 16.4
-        run: sudo xcode-select -s "/Applications/Xcode_16.4.app/Contents/Developer"
-
       - name: Init git repo (required by nimble)
         working-directory: mobile-app
         run: |
           git init
           git config user.email "ci@test.com"
           git config user.name "CI"
           git add -A
-          git commit -m "init"
+          git diff --cached --quiet || git commit -m "init"
 
       - name: Install Nim deps (Nix nimble links OpenSSL 3 + Security.framework which clash)
         run: |

.github/workflows/validate-template.yml

@@ -91,7 +91,7 @@ jobs:
 
   scaffold-and-build-ios:
     name: Template → iOS Build
-    runs-on: macos-15
+    runs-on: bladerunner-macos
 
     steps:
       - name: Checkout repository
@@ -140,15 +140,6 @@ jobs:
           brew install nim
           echo "$HOME/.nimble/bin" >> $GITHUB_PATH
 
-      - name: Setup Ruby
-        uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: '3.0'
-          working-directory: test-app/ios
-
-      - name: Select Xcode 16.4
-        run: sudo xcode-select -s "/Applications/Xcode_16.4.app/Contents/Developer"
-
       - name: Build iOS
         working-directory: test-app
         env:

flake.nix

@@ -113,10 +113,15 @@
               # Nix transitive deps (e.g. nim → apple-sdk) set SDKROOT/DEVELOPER_DIR
               # to the Nix SDK and put a broken xcrun wrapper in PATH, unset these
               # and prepend /usr/bin so system Xcode tools take priority.
-              unset DEVELOPER_DIR SDKROOT
+              unset SDKROOT
               unset NIX_CFLAGS_COMPILE NIX_ENFORCE_NO_NATIVE
               unset NIX_IGNORE_LD_THROUGH_GCC NIX_DONT_SET_RPATH NIX_DONT_SET_RPATH_FOR_BUILD NIX_NO_SELF_RPATH
               export PATH="/usr/bin:$PATH"
+              if [ -d /Applications/Xcode.app/Contents/Developer ]; then
+                export DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer
+              else
+                unset DEVELOPER_DIR
+              fi
               echo "  • macOS: iOS and Android development available"
               echo "  • CocoaPods: $(pod --version 2>/dev/null || echo 'not available')"
             else

mobile-app/Makefile

@@ -121,6 +121,8 @@ build-nim: nim-static-lib nim-bindings nim-headers
 build-ios: install build-nim codegen pod-install
 	@echo "Building iOS Simulator app..."
 	@set -o pipefail && env -i HOME=$(HOME) PATH=/usr/bin:/bin:/usr/sbin:/sbin LANG=en_US.UTF-8 \
+		DEVELOPER_DIR="$$DEVELOPER_DIR" \
+		TMPDIR="$$TMPDIR" \
 		xcodebuild -workspace $(XCODE_WORKSPACE) \
 		-scheme $(XCODE_SCHEME) \
 		-sdk iphonesimulator \

mobile-app/ios/Podfile

@@ -53,6 +53,20 @@ target 'nimrnmobileapp' do
       :ccache_enabled => podfile_properties['apple.ccacheEnabled'] == 'true',
     )
 
+    # fmt 11.0.2 (bundled with RN 0.81) emits FMT_STRING("...") lambdas
+    # that Xcode 26's clang rejects as not constant-evaluable. Strip the
+    # wrapper so the literal goes through the plain consteval ctor path.
+    # Remove when bumping to RN 0.82 (ships fmt prebuilt).
+    fmt_inl = File.join(installer.sandbox.root, 'fmt/include/fmt/format-inl.h')
+    if File.exist?(fmt_inl)
+      content = File.read(fmt_inl)
+      patched = content.gsub(/FMT_STRING\(("[^"]*")\)/, '\1')
+      if patched != content
+        File.chmod(0644, fmt_inl)
+        File.write(fmt_inl, patched)
+      end
+    end
+
     # fix for Xcode 16 build issues
     installer.pods_project.targets.each do |target|
       target.build_configurations.each do |config|

mobile-app/ios/Podfile.lock

@@ -2924,6 +2924,6 @@ SPEC CHECKSUMS:
   SocketRocket: d4aabe649be1e368d1318fdf28a022d714d65748
   Yoga: 922d794dce2af9c437f864bf4093abfa7a131adb
 
-PODFILE CHECKSUM: 30222b370f2c6e2622deeb5e8d786e95202de871
+PODFILE CHECKSUM: 2c305444c70fa279b301b0f41b47d1e9fa4781e9
 
 COCOAPODS: 1.16.2