freestanding support (#14076)

.github/workflows/test.yml

@@ -94,6 +94,7 @@ jobs:
       - build-cmake
       - build-flatpak
       - build-libghostty-vt
+      - build-libghostty-vt-freestanding
       - build-libghostty-vt-wasm
       - build-libghostty-vt-features
       - build-libghostty-vt-android
@@ -649,6 +650,45 @@ jobs:
           nix develop -c zig build -Demit-lib-vt \
             -Dtarget=${{ matrix.target }}
 
+  build-libghostty-vt-freestanding:
+    strategy:
+      matrix:
+        include:
+          - target: riscv32-freestanding-eabi
+            cpu: baseline
+          - target: thumb-freestanding-eabi
+            cpu: cortex_m4
+    runs-on: namespace-profile-ghostty-sm
+    needs: test
+    env:
+      ZIG_LOCAL_CACHE_DIR: /zig/local-cache
+      ZIG_GLOBAL_CACHE_DIR: /zig/global-cache
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+
+      - name: Setup Cache
+        uses: namespacelabs/nscloud-cache-action@c5f8dab7560444c4bf8dbc64f1b203431873c547 # v1.6.1
+        with:
+          path: |
+            /nix
+            /zig
+
+      - uses: cachix/install-nix-action@13d8dd58da0234aa297dedd986986ccb8e7f3e24 # v31.11.1
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@5f2d7c5294214f71b873db4b969586b980625e71 # v17
+        with:
+          name: ghostty
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+
+      - name: Build
+        run: |
+          nix develop -c zig build -Demit-lib-vt \
+            -Dtarget=${{ matrix.target }} \
+            -Dcpu=${{ matrix.cpu }} \
+            -Doptimize=ReleaseSafe
+
   build-libghostty-vt-wasm:
     runs-on: namespace-profile-ghostty-sm
     needs: test