build: flatpak and deb targets, Gitea Actions workflow

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

.gitea/workflows/build.yml

@@ -0,0 +1,57 @@
+# Builds Ink for Linux and Windows on every v* tag (or by hand) on a Gitea Actions runner.
+# macOS needs a Mac runner labelled "macos"; the job below stays off until you add one.
+name: build
+on:
+  push:
+    tags: ['v*']
+  workflow_dispatch:
+
+jobs:
+  linux:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Tools
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y flatpak flatpak-builder fakeroot dpkg rpm libarchive-tools
+          sudo flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
+          sudo flatpak install -y flathub org.freedesktop.Platform//25.08 org.freedesktop.Sdk//25.08 org.electronjs.Electron2.BaseApp//25.08
+          npm i -g bun
+      - run: bun install --frozen-lockfile --ignore-scripts
+      - run: bun run build
+      - run: bunx electron-builder --linux AppImage deb flatpak
+      - uses: actions/upload-artifact@v3
+        with:
+          name: linux
+          path: |
+            dist/*.AppImage
+            dist/*.deb
+            dist/*.flatpak
+
+  windows:
+    runs-on: ubuntu-latest
+    container: electronuserland/builder:wine
+    steps:
+      - uses: actions/checkout@v4
+      - run: npm i -g bun
+      - run: bun install --frozen-lockfile --ignore-scripts
+      - run: bun run build
+      - run: bunx electron-builder --win nsis
+      - uses: actions/upload-artifact@v3
+        with:
+          name: windows
+          path: dist/*.exe
+
+  # macos:
+  #   runs-on: macos
+  #   steps:
+  #     - uses: actions/checkout@v4
+  #     - run: npm i -g bun
+  #     - run: bun install --frozen-lockfile --ignore-scripts
+  #     - run: bun run build
+  #     - run: bunx electron-builder --mac dmg
+  #     - uses: actions/upload-artifact@v3
+  #       with:
+  #         name: macos
+  #         path: dist/*.dmg