Add Gitea Actions workflows

CI for both apps and the Rust crates, image publishing to GHCR, and the
arm64 kiosk package build.

.gitea/workflows/release.yml

@@ -0,0 +1,55 @@
+name: Release
+
+# Container images are published separately by publish-images.yml. This builds the kiosk
+# package for the Pi, which needs an arm64 toolchain rather than a Docker build.
+on:
+  push:
+    tags: ["v*"]
+  workflow_dispatch:
+
+jobs:
+  kiosk-deb:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: docker/setup-qemu-action@v3
+        with:
+          platforms: arm64
+
+      - name: Build the kiosk bundle for arm64
+        run: |
+          docker run --rm --platform linux/arm64 \
+            -v "$PWD:/work" -w /work \
+            arm64v8/debian:bookworm \
+            bash -eux -c '
+              export DEBIAN_FRONTEND=noninteractive
+              apt-get update
+              apt-get install -y --no-install-recommends \
+                curl ca-certificates unzip build-essential file wget \
+                libwebkit2gtk-4.1-dev libgtk-3-dev librsvg2-dev \
+                libayatana-appindicator3-dev libssl-dev patchelf pkg-config
+
+              curl -fsSL https://sh.rustup.rs | sh -s -- -y --profile minimal
+              . "$HOME/.cargo/env"
+
+              curl -fsSL https://bun.sh/install | bash
+              export PATH="$HOME/.bun/bin:$PATH"
+
+              bun install
+              export PATH="/work/node_modules/.bin:$PATH"
+              bun run build:kiosk
+            '
+
+      - name: Collect artifacts
+        run: |
+          mkdir -p dist
+          find apps/kiosk-client/src-tauri/target/release/bundle -name '*.deb' -exec cp {} dist/ \;
+          find apps/kiosk-client/src-tauri/target/release/bundle -name '*.AppImage' -exec cp {} dist/ \;
+          ls -lh dist
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: pistation-kiosk-arm64
+          path: dist/*
+          if-no-files-found: error