feat: add Docker support and enhance environment configuration

- Introduce .dockerignore for Docker build optimization
- Add Dockerfile for containerization setup
- Update .env.example to clear Sentry variables and rename HOST to TELEGRAM_HOST
- Modify astro.config.mjs to conditionally exclude SSR dependencies in Docker builds
- Adjust postinstall script to safely handle missing .git directory
- Refactor telegram host retrieval for clarity and consistency

Dockerfile

@@ -0,0 +1,27 @@
+FROM node:lts-alpine AS base
+
+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 . .
+RUN export $(cat .env.example) && export DOCKER=true && pnpm run build
+
+FROM base AS runtime
+# COPY --from=prod-deps /app/node_modules ./node_modules
+COPY --from=build /app/dist ./dist
+
+ENV HOST=0.0.0.0
+ENV PORT=4321
+EXPOSE 4321
+CMD node ./dist/server/entry.mjs