Switch base images from Docker Hub to GHCR mirror

Avoids Docker Hub 429 rate limits by pulling node:20-alpine and
nginx:stable-alpine from ghcr.io/cartsnitch/mirror/. GHCR login
now runs on all builds (not just main push) to authenticate pulls.

Ref: cartsnitch/infra#7, CAR-55

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.github/workflows/ci.yml

@@ -51,14 +51,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Log in to Docker Hub
-        uses: docker/login-action@v3
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-
       - name: Log in to GHCR
-        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}

Dockerfile

@@ -1,5 +1,5 @@
 # Stage 1: Build
-FROM node:20-alpine AS build
+FROM ghcr.io/cartsnitch/mirror/node:20-alpine AS build
 
 WORKDIR /app
 
@@ -10,7 +10,7 @@ COPY . .
 RUN npm run build
 
 # Stage 2: Production
-FROM nginx:stable-alpine AS prod
+FROM ghcr.io/cartsnitch/mirror/nginx:stable-alpine AS prod
 
 COPY --from=build /app/dist /usr/share/nginx/html
 COPY nginx.conf /etc/nginx/conf.d/default.conf

renovate.json

@@ -0,0 +1,4 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["local>cartsnitch/.github:renovate-config"]
+}