Revert to npm due to Docusaurus 2.x compatibility issues

Bun's package resolution installs different versions of dependencies
(e.g., undici) that are incompatible with Node.js runtime, which is
required for Docusaurus SSR.

Keeping bun.lock for developers who want to use Bun locally, but
CI/production builds use npm for compatibility.

Author: claude

.ci/validate-feeds.sh

@@ -4,7 +4,7 @@
 set -e
 
 echo "Building site to generate feeds..."
-bun run build
+npm run build
 
 echo ""
 echo "Validating RSS/Atom feeds..."

.gitlab-ci.yml

@@ -24,17 +24,13 @@ variables:
 # Validate RSS/Atom feeds before building and deploying
 validate_feeds:
   stage: validate
-  image: node:18-bookworm
-  variables:
-    BUN_INSTALL: "$HOME/.bun"
-    PATH: "$HOME/.bun/bin:$PATH"
+  image: node:18
   before_script:
-    # Install xmllint for XML validation and bun
-    - apt-get update && apt-get install -y libxml2-utils jq unzip
-    - curl -fsSL https://bun.sh/install | bash
-    - $HOME/.bun/bin/bun install --frozen-lockfile
+    # Install xmllint for XML validation
+    - apt-get update && apt-get install -y libxml2-utils jq
+    - npm ci
   script:
-    - export PATH="$HOME/.bun/bin:$PATH" && bash .ci/validate-feeds.sh
+    - bash .ci/validate-feeds.sh
   artifacts:
     when: on_failure
     paths:

Dockerfile

@@ -24,22 +24,17 @@ ENV UMAMI_WEBSITE_ID=$ARG_UMAMI_WEBSITE_ID
 ARG ARG_UMAMI_SCRIPT_URL
 ENV UMAMI_SCRIPT_URL=$ARG_UMAMI_SCRIPT_URL
 
-# Install bun
-RUN curl -fsSL https://bun.sh/install | bash
-ENV BUN_INSTALL="/root/.bun"
-ENV PATH="$BUN_INSTALL/bin:$PATH"
-
 WORKDIR /docs
 
 COPY package.json ./
-COPY bun.lock ./
-RUN bun install --frozen-lockfile
+COPY package-lock.json ./
+RUN npm ci
 
 COPY . .
 # Make cache folder if not exists.
 RUN mkdir -p .cache
 RUN mv .cache node_modules
-RUN bun run build
+RUN npm run build
 
 EXPOSE 3000
-CMD ["bun", "run", "serve"]
+CMD ["npm", "run", "serve"]