ci/cd: added docker files

Dockerfile

@@ -0,0 +1,18 @@
+FROM node:22-slim AS base
+ENV PNPM_HOME="/pnpm"
+ENV PATH="$PNPM_HOME:$PATH"
+RUN corepack enable
+COPY . /app
+WORKDIR /app
+
+FROM base AS build
+ARG CI=true
+ARG VITE_BACKEND_DOMAIN
+ENV VITE_BACKEND_DOMAIN=$VITE_BACKEND_DOMAIN
+RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --frozen-lockfile
+RUN pnpm run build
+
+FROM caddy:alpine
+COPY Caddyfile /etc/caddy/Caddyfile
+COPY --from=build /app/dist /usr/share/caddy
+EXPOSE 80