Add docker build, rewrite Actions for Gitea, and add healthcheck endpoint.

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Commands
+
+```bash
+# Build
+cargo build
+cargo build --release
+
+# Run (requires config.toml or APP__ env vars)
+cargo run
+
+# Check without building
+cargo check
+
+# Run tests
+cargo test
+
+# Run a single test
+cargo test <test_name>
+
+# Lint
+cargo clippy
+
+# Format
+cargo fmt
+```
+
+## Configuration
+
+Copy `config.example.toml` to `config.toml` and fill in the values. All config fields can be overridden with `APP__` prefixed environment variables using `__` as separator (e.g. `APP__DATABASE__URL`, `APP__S3__BUCKET`).
+
+Supports both SQLite (`sqlite://mikebase.db`) and PostgreSQL (`postgresql://user:pass@host/db`) via `sqlx::AnyPool`.
+
+## Architecture
+
+The app is an Axum HTTP server with shared state (`AppState`) containing two components:
+- **`Database`** (`src/db.rs`): Thin wrapper around `sqlx::AnyPool` supporting SQLite and PostgreSQL. Runs migrations from `migrations/` on startup. All timestamps are stored as ISO 8601 strings (not native DB types) because `sqlx::Any` lacks a blanket chrono `Encode`/`Decode` impl.
+- **`S3Storage`** (`src/storage.rs`): AWS SDK S3 client pointed at a configurable endpoint (Wasabi by default). Images are uploaded under the key `emoji/<filename>` and public URLs are built from the configured `public_url` base.
+
+**Data flow for emote creation:** multipart form → upload bytes to S3 → insert row into DB → return `EmoteResponse` JSON.
+
+**Models** (`src/models.rs`):
+- `EmoteRow` — raw DB row (timestamps as strings)
+- `EmoteResponse` — JSON API response (timestamps as `DateTime<Utc>`)
+
+**Routes** (`src/routes/`):
+- `GET /` — health check
+- `GET /version` — git commit hash and tag (baked in at build time via `build.rs`)
+- `GET /json` — list all emotes
+- `POST /emotes` — create emote (multipart: `name`, `alias?`, `file`)
+- `PUT /emotes/{uuid}` — update emote metadata (JSON: `name?`, `alias?`, `image_key?`)
+- `DELETE /emotes/{uuid}` — delete emote from DB and S3 (S3 delete is best-effort)
+
+## Releases
+
+Pushing a `v*` tag triggers the GitHub Actions release workflow, which builds a Linux binary and uploads it to a GitHub Release.