ci) add gitea actions and refresh readme (#1)

Summary:\n- replace scaffold README with project-specific setup, testing, Docker, and CI docs\n- add PR workflow to run lint, unit tests, app build, and Docker build\n- add main-branch workflow to build and push Docker images to Gitea registry\n\nNotes:\n- publish workflow expects REGISTRY_USERNAME and REGISTRY_PASSWORD repository secrets\n- image tags pushed: latest and short commit SHA\n\nTesting:\n- not run locally (workflows execute in Gitea Actions)
Reviewed-on: CampbellWireless/trips#1
Co-authored-by: Shaun Campbell <shaun@campbellwireless.net>
Co-committed-by: Shaun Campbell <shaun@campbellwireless.net>

Dockerfile

@@ -7,24 +7,22 @@ WORKDIR /app
 COPY package.json bun.lock ./
 
 # Install all deps (including devDependencies needed for the build).
-# better-sqlite3 is a native module — it must be compiled here on Linux,
-# not copied from a macOS node_modules.
 RUN bun install --frozen-lockfile
 
 # Copy source and build
 COPY . .
 RUN bun run build
 
-# Prune to production-only deps, recompiling native modules for Linux
+# Prune to production-only deps
 RUN bun install --frozen-lockfile --production
 
 # ── Runtime stage ───────────────────────────────────────────────────────────────
-FROM node:22-alpine AS runtime
+FROM oven/bun:1 AS runtime
 
 WORKDIR /app
 
 # Create a non-root user to run the app
-RUN addgroup -S trips && adduser -S trips -G trips
+RUN groupadd --system trips && useradd --system --gid trips trips
 
 # Copy the built app and production node_modules from the builder
 COPY --from=builder /app/build ./build
@@ -42,4 +40,4 @@ ENV PORT=3000
 
 EXPOSE 3000
 
-CMD ["node", "build"]
+CMD ["bun", "build/index.js"]