ci: switch to Tahoe for builds

.github/workflows/test.yml

@@ -18,7 +18,6 @@ jobs:
       - build-nix
       - build-snap
       - build-macos
-      - build-macos-tahoe
       - build-macos-matrix
       - build-windows
       - flatpak-check-zig-cache
@@ -273,53 +272,6 @@ jobs:
             ghostty-source.tar.gz
 
   build-macos:
-    runs-on: namespace-profile-ghostty-macos-sequoia-edge
-    needs: test
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
-
-      # Install Nix and use that to run our tests so our environment matches exactly.
-      - uses: cachix/install-nix-action@fc6e360bedc9ee72d75e701397f0bb30dce77568 # v31.5.2
-        with:
-          nix_path: nixpkgs=channel:nixos-unstable
-      - uses: cachix/cachix-action@0fc020193b5a1fa3ac4575aa3a7d3aa6a35435ad # v16
-        with:
-          name: ghostty
-          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
-
-      - name: Xcode Select
-        run: sudo xcode-select -s /Applications/Xcode_26.0.app
-
-      - name: Xcode Version
-        run: xcodebuild -version
-
-      # Workaround a bug where some Namespace images don't have the the metal
-      # toolchain installed. We should be able to remove this eventually.
-      - run: xcodebuild -downloadComponent MetalToolchain
-
-      - name: get the Zig deps
-        id: deps
-        run: nix build -L .#deps && echo "deps=$(readlink ./result)" >> $GITHUB_OUTPUT
-
-      # GhosttyKit is the framework that is built from Zig for our native
-      # Mac app to access.
-      - name: Build GhosttyKit
-        run: nix develop -c zig build --system ${{ steps.deps.outputs.deps }} -Demit-macos-app=false
-
-      # The native app is built with native Xcode tooling. This also does
-      # codesigning. IMPORTANT: this must NOT run in a Nix environment.
-      # Nix breaks xcodebuild so this has to be run outside.
-      - name: Build Ghostty.app
-        run: cd macos && xcodebuild -target Ghostty
-
-      # Build the iOS target without code signing just to verify it works.
-      - name: Build Ghostty iOS
-        run: |
-          cd macos
-          xcodebuild -target Ghostty-iOS "CODE_SIGNING_ALLOWED=NO"
-
-  build-macos-tahoe:
     runs-on: namespace-profile-ghostty-macos-tahoe
     needs: test
     steps:
@@ -363,16 +315,16 @@ jobs:
           xcodebuild -target Ghostty-iOS "CODE_SIGNING_ALLOWED=NO"
 
   build-macos-matrix:
-    runs-on: namespace-profile-ghostty-macos-sequoia-edge
+    runs-on: namespace-profile-ghostty-macos-tahoe
     needs: test
     steps:
       - name: Checkout code
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
-      # Install Nix and use that to run our tests so our environment matches exactly.
-      - uses: cachix/install-nix-action@fc6e360bedc9ee72d75e701397f0bb30dce77568 # v31.5.2
+      # TODO(tahoe): https://github.com/NixOS/nix/issues/13342
+      - uses: DeterminateSystems/nix-installer-action@main
         with:
-          nix_path: nixpkgs=channel:nixos-unstable
+          determinate: true
       - uses: cachix/cachix-action@0fc020193b5a1fa3ac4575aa3a7d3aa6a35435ad # v16
         with:
           name: ghostty
@@ -682,16 +634,16 @@ jobs:
           nix develop -c zig build -Dsentry=${{ matrix.sentry }}
 
   test-macos:
-    runs-on: namespace-profile-ghostty-macos-sequoia-edge
+    runs-on: namespace-profile-ghostty-macos-tahoe
     needs: test
     steps:
       - name: Checkout code
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
-      # Install Nix and use that to run our tests so our environment matches exactly.
-      - uses: cachix/install-nix-action@fc6e360bedc9ee72d75e701397f0bb30dce77568 # v31.5.2
+      # TODO(tahoe): https://github.com/NixOS/nix/issues/13342
+      - uses: DeterminateSystems/nix-installer-action@main
         with:
-          nix_path: nixpkgs=channel:nixos-unstable
+          determinate: true
       - uses: cachix/cachix-action@0fc020193b5a1fa3ac4575aa3a7d3aa6a35435ad # v16
         with:
           name: ghostty