Allow docs to run fully offline

docs/Dockerfile

@@ -1,6 +1,32 @@
-FROM node:20-alpine
+FROM node:20-alpine AS builder
+
 WORKDIR /app
-RUN npm install -g mint
+
+RUN npm install -g mint@4.2.13
+
 COPY . .
+
+# Install a local version of our OpenAPI spec
+RUN apk add --no-cache wget jq && \
+    wget -O spec.json https://app.infisical.com/api/docs/json && \
+    jq '.api.openapi = "./spec.json"' docs.json > temp.json && \
+    mv temp.json docs.json
+
+# Run mint dev briefly to download the web client
+RUN timeout 30 mint dev || true
+
+FROM node:20-alpine
+
+WORKDIR /app
+
+RUN npm install -g mint@4.2.13
+
+COPY . .
+
+COPY --from=builder /root/.mintlify /root/.mintlify
+COPY --from=builder /app/docs.json /app/docs.json
+COPY --from=builder /app/spec.json /app/spec.json
+
 EXPOSE 3000
+
 CMD ["mint", "dev"]