add docker build and push workflow

Dockerfile

@@ -1,28 +1,18 @@
-FROM node:alpine AS base
-# add pnpm
+FROM node:slim AS base
+ENV PNPM_HOME="/pnpm"
+ENV PATH="${PNPM_HOME}:${PATH}"
 RUN corepack enable
-RUN corepack prepare pnpm@latest --activate
-
-
-FROM base as deps
+COPY . /app
 WORKDIR /app
-# install dependencies with pnpm
-COPY package.json pnpm-lock.yaml* ./
-RUN pnpm i --frozen-lockfile
 
+FROM base as prod-deps
+RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --prod --frozen-lockfile
 
-FROM base as builder
-WORKDIR /app
-COPY --from=deps /app/node_modules ./node_modules
-COPY . .
-RUN pnpm build
+FROM base AS build
+RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --frozen-lockfile
+RUN pnpm run build
 
-
-FROM base as runner
-WORKDIR /app
-COPY --from=builder /app/dist ./dist
-COPY --from=builder /app/node_modules ./node_modules
-
-USER node
-
-CMD ["node", "./dist/index.js"]
+FROM base
+COPY --from=prod-deps /app/node_modules /app/node_modules
+COPY --from=build /app/dist /app/dist
+CMD [ "pnpm", "start" ]