release-tip workflow (wip)

.github/workflows/release-tip.yml

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+on:
+  workflow_run:
+    workflows: [Test]
+    types: [completed]
+    branches: [main]
+
+name: Release Tip
+
+jobs:
+  build-macos:
+    if: ${{ github.event.workflow_run.conclusion == 'success' }}
+    runs-on: ubuntu-latest
+    env:
+      # Needed for macos SDK
+      AGREE: "true"
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+      with:
+        submodules: recursive
+        fetch-depth: 0
+
+    # Install Nix and use that so our environment matches exactly.
+    - uses: cachix/install-nix-action@v18
+      with:
+        nix_path: nixpkgs=channel:nixos-unstable
+
+    # Cross-compile the binary. We always use static building for this
+    # because its the only way to access the headers.
+    - name: Build aarch64
+      run: |
+        nix develop -c zig build -Dcpu=baseline -Dstatic=true -Dtarget=aarch64-macos -Drelease-fast
+        mv zig-out/bin/ghostty zig-out/bin/ghostty-aarch64-macos
+    - name: Build x86_64
+      run: |
+        nix develop -c zig build -Dcpu=baseline -Dstatic=true -Dtarget=x86_64-macos -Drelease-fast
+        mv zig-out/bin/ghostty zig-out/bin/ghostty-x86_64-macos
+
+    - name: Create Universal Binary
+      run: |
+        # Lipo our binaries
+        nix develop -c \
+          llvm-lipo \
+          zig-out/bin/ghostty-aarch64-macos \
+          zig-out/bin/ghostty-x86_64-macos \
+          -create \
+          -output zig-out/bin/ghostty-universal
+
+        # Ensure the app is universal
+        cp zig-out/bin/ghostty-universal zig-out/Ghostty.app/Contents/MacOS/ghostty
+
+    # Zip up the app
+    - name: Zip App
+      run: nix develop -c sh -c 'cd zig-out && zip -9 -r ../ghostty-macos-universal.zip Ghostty.app'
+
+    # Update Release
+    - name: Release
+      uses: softprops/action-gh-release@v1
+      if: startsWith(github.ref, 'refs/tags/')
+      with:
+        name: "Ghostty Tip (\"Nightly\")"
+        prerelease: true
+        tag_name: tip
+        files: ghostty-macos-universal.zip