chore(ci): try to fix arm v6/v7 build

.github/workflows/main-docker.yml

@@ -116,6 +116,12 @@ jobs:
           - dockerfile: Dockerfile
             platform: linux/arm64
             image: ubuntu-24.04-arm
+          - dockerfile: Dockerfile.legacy
+            platform: linux/arm/v7
+            image: ubuntu-24.04-arm
+          - dockerfile: Dockerfile.legacy
+            platform: linux/arm/v8
+            image: ubuntu-24.04-arm
     runs-on: ${{ matrix.image }}
     needs:
       - test_docker

apps/server/Dockerfile.legacy

@@ -0,0 +1,28 @@
+FROM node:22.21.0-bullseye-slim AS builder
+RUN corepack enable
+
+# Install native dependencies since we might be building cross-platform.
+WORKDIR /usr/src/app/build
+COPY ./docker/package.json ./docker/pnpm-workspace.yaml /usr/src/app/
+# We have to use --no-frozen-lockfile due to CKEditor patches
+RUN pnpm install --no-frozen-lockfile --prod && pnpm rebuild
+
+FROM node:24.10.0-bullseye-slim
+# Install only runtime dependencies
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+    gosu && \
+    rm -rf \
+    /var/lib/apt/lists/* \
+    /var/cache/apt/*
+
+WORKDIR /usr/src/app
+COPY ./dist /usr/src/app
+RUN rm -rf /usr/src/app/node_modules/better-sqlite3
+COPY --from=builder /usr/src/app/node_modules/better-sqlite3 /usr/src/app/node_modules/better-sqlite3
+COPY ./start-docker.sh /usr/src/app
+
+# Configure container
+EXPOSE 8080
+CMD [ "sh", "./start-docker.sh" ]
+HEALTHCHECK --start-period=10s CMD exec gosu node node /usr/src/app/docker_healthcheck.cjs