fix: restore armv7 docker base image (#337)

docker/Dockerfile

@@ -1,5 +1,7 @@
 # syntax=docker/dockerfile:1.7
-FROM node:25-bookworm-slim AS builder
+# Keep the Docker base on Node 22 because the official Node 24/25 slim images
+# no longer publish linux/arm/v7 manifests, which breaks our armv7 Docker jobs.
+FROM node:22-bookworm-slim AS builder
 
 WORKDIR /app
 
@@ -17,7 +19,7 @@ COPY . .
 RUN npm run build:web && npm run build:server
 RUN --mount=type=cache,target=/root/.npm npm prune --omit=dev --no-audit --no-fund
 
-FROM node:25-bookworm-slim
+FROM node:22-bookworm-slim
 
 WORKDIR /app
 

scripts/dev/docker.workflow.test.ts

@@ -19,10 +19,8 @@ describe('docker workflows', () => {
   it('uses an armv7-capable node base image in the Dockerfile', () => {
     const dockerfile = readFileSync(resolve(process.cwd(), 'docker/Dockerfile'), 'utf8');
 
-    const fromMatches = [...dockerfile.matchAll(/^FROM node:(\d+)-bookworm-slim(?: AS builder)?$/gm)];
-
-    expect(fromMatches).toHaveLength(2);
-    expect(fromMatches[0]?.[1]).toBe(fromMatches[1]?.[1]);
+    expect(dockerfile).toContain('FROM node:22-bookworm-slim AS builder');
+    expect(dockerfile).toContain('FROM node:22-bookworm-slim');
   });
 
   it('keeps server docker builds isolated from desktop packaging dependencies', () => {