add Dockerfile to build astro and pocketbase

Dockerfile

@@ -0,0 +1,43 @@
+# PocketBase Stage
+FROM alpine:latest as pocketbase
+
+ARG PB_VERSION=0.20.5
+
+RUN apk add --no-cache \
+    unzip \
+    ca-certificates
+
+# download and unzip PocketBase
+ADD https://github.com/pocketbase/pocketbase/releases/download/v${PB_VERSION}/pocketbase_${PB_VERSION}_linux_amd64.zip /tmp/pb.zip
+RUN unzip /tmp/pb.zip -d /pb/
+
+# Uncomment if you want to add migrations and hooks
+# COPY ./pb_migrations /pb/pb_migrations
+# COPY ./pb_hooks /pb/pb_hooks
+
+EXPOSE 8080
+
+# Node Stage
+FROM node:20-slim AS base
+ENV PNPM_HOME="/pnpm"
+ENV PATH="$PNPM_HOME:$PATH"
+RUN corepack enable
+COPY . /app
+WORKDIR /app
+
+FROM base AS prod-deps
+RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --prod --frozen-lockfile
+
+FROM base AS build
+RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --frozen-lockfile
+RUN pnpm run build
+
+# Final Stage
+FROM pocketbase
+
+# Copy built Node application to a directory in the PocketBase image
+COPY --from=build /app/dist /pb/pb_public
+
+# Start PocketBase
+CMD ["/pb/pocketbase", "serve", "--http=0.0.0.0:8080"]
+