Merge pull request 'Dockerfile без Alpine — curl в healthcheck падал на ВМ staging' (#4) from fix/no-alpine-runtime into master

Reviewed-on: #4

backend/Dockerfile

@@ -1,7 +1,9 @@
 # Build context: repository root (docker compose: context ".", dockerfile backend/Dockerfile)
+# No Alpine images: on Jambotron staging VMs (kernel 6.18.55-virt) binaries from Alpine 3.24.3
+# (musl 1.2.6) die with "Bus error" — java survived, curl in the healthcheck did not (2026-11-05)
 
 # 1. Web client (Angular) — served by the backend from classpath:/static
-FROM node:22-alpine AS web
+FROM node:22-bookworm-slim AS web
 WORKDIR /web
 COPY frontend/package*.json ./
 RUN npm install --no-audit --no-fund
@@ -9,7 +11,7 @@ COPY frontend/ ./
 RUN npx ng build --configuration=production
 
 # 2. Backend
-FROM eclipse-temurin:21-jdk-alpine AS build
+FROM eclipse-temurin:21-jdk AS build
 WORKDIR /app
 COPY gradlew settings.gradle ./
 COPY gradle gradle
@@ -19,12 +21,13 @@ COPY --from=web /web/dist/frontend/browser backend/src/main/resources/static
 RUN chmod +x gradlew && ./gradlew :backend:bootJar --no-daemon -x test
 
 # 3. Runtime: not root; data in /app/data (volume)
-FROM eclipse-temurin:21-jre-alpine
-RUN apk add --no-cache curl && addgroup -S mail && adduser -S -G mail mail \
-    && mkdir -p /app/data/attachments /app/data/dkim-keys && chown -R mail:mail /app/data
+FROM eclipse-temurin:21-jre
+# Ubuntu image, curl included; own user: "mail" already exists (uid 8)
+RUN groupadd -r -g 10001 app && useradd -r -u 10001 -g app -d /app -s /usr/sbin/nologin app \
+    && mkdir -p /app/data/attachments /app/data/dkim-keys && chown -R app:app /app/data
 WORKDIR /app
 COPY --from=build /app/backend/build/libs/*.jar app.jar
-USER mail
+USER app
 ENV MAIL_ATTACHMENTS_DIR=/app/data/attachments DKIM_KEYS_DIR=/app/data/dkim-keys
 EXPOSE 8080 3025
 HEALTHCHECK --interval=30s --timeout=5s --start-period=60s --retries=3 \

docker-compose.jambotron.yml

@@ -17,13 +17,15 @@ services:
         for name in DB_PASSWORD JWT_SECRET; do
           [ -s /secrets/$$name ] || head -c 48 /dev/urandom | base64 | tr -dc 'A-Za-z0-9' > /secrets/$$name
         done
-        # postgres reads it as uid 70, the app as "mail" — readable inside these containers only
+        # postgres reads it as uid 70, the app as uid 10001 — readable inside these containers only
         chmod 644 /secrets/DB_PASSWORD /secrets/JWT_SECRET
     volumes:
       - secrets:/secrets
 
   db:
-    image: postgres:17-alpine
+    # Debian, not -alpine: on Jambotron staging VMs (Alpine 3.24, kernel 6.18) the Alpine build of postgres
+    # dies with "Bus error" even on --version; the Debian build works (2026-11-05)
+    image: postgres:17
     restart: unless-stopped
     depends_on:
       secrets-init: