feat(Dockerfile): use Alpine base image and add healthcheck

Dockerfile

@@ -1,19 +1,15 @@
-FROM node:20-slim AS base
+# Build Stage
+FROM node:20-alpine AS build
 
 ENV PNPM_HOME="/pnpm"
 ENV PATH="$PNPM_HOME:$PATH"
 RUN corepack enable
 
 WORKDIR /app
+
 COPY package.json pnpm-lock.yaml ./
-
-FROM base AS prod-deps
-RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --prod --frozen-lockfile
-
-FROM base AS build-deps
 RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --frozen-lockfile
 
-FROM build-deps AS build
 COPY . .
 ARG SITE_URL
 ENV SITE_URL=${SITE_URL}
@@ -21,10 +17,21 @@ ARG DIRECTUS_URL
 ENV DIRECTUS_URL=${DIRECTUS_URL}
 RUN pnpm run build
 
+# Runtime Stage
 FROM nginx:1.25-alpine AS runtime
+
+# Copy custom nginx config
 COPY nginx/nginx.conf /etc/nginx/nginx.conf
+
+# Copy built assets from build stage
 COPY --from=build /app/dist /usr/share/nginx/html
 
+# Add curl for healthchecks
+RUN apk add --no-cache curl
+
+# Healthcheck
+HEALTHCHECK --interval=30s --timeout=3s CMD curl -f http://localhost/ || exit 1
+
 EXPOSE 80
 
 CMD ["nginx", "-g", "daemon off;"]