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devops(backend): pin eclipse-temurin tags, skip test compilation, document jar glob

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- Pin to eclipse-temurin:21.0.10_7-{jdk,jre}-noble for reproducible builds
- Switch -DskipTests to -Dmaven.test.skip=true: skips test compilation entirely,
  not just execution — faster and avoids build failures from test-only missing classes
- Add comment on COPY *.jar explaining why the glob is safe (Spring Boot renames
  the pre-repackage artifact to .jar.original, leaving only one .jar in target/)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Marcel
2026-04-15 11:29:13 +02:00
committed by marcel
parent 04069c0286
commit 48223d5a3d
1 changed files with 5 additions and 3 deletions
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backend/Dockerfile
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@@ -1,4 +1,4 @@
FROM eclipse-temurin:21-jdk AS builder FROM eclipse-temurin:21.0.10_7-jdk-noble AS builder
WORKDIR /app WORKDIR /app
# Copy wrapper and POM first — dependency layer is cached separately from source # Copy wrapper and POM first — dependency layer is cached separately from source
@@ -7,10 +7,12 @@ COPY mvnw pom.xml ./
RUN --mount=type=cache,target=/root/.m2 ./mvnw dependency:go-offline -q RUN --mount=type=cache,target=/root/.m2 ./mvnw dependency:go-offline -q
COPY src ./src COPY src ./src
RUN --mount=type=cache,target=/root/.m2 ./mvnw clean package -DskipTests -q # -Dmaven.test.skip=true skips test compilation entirely (not just execution)
RUN --mount=type=cache,target=/root/.m2 ./mvnw clean package -Dmaven.test.skip=true -q
FROM eclipse-temurin:21-jre FROM eclipse-temurin:21.0.10_7-jre-noble
WORKDIR /app WORKDIR /app
# Spring Boot repackages to *.jar; pre-repackage artifact uses .jar.original, not .jar
COPY --from=builder /app/target/*.jar app.jar COPY --from=builder /app/target/*.jar app.jar
EXPOSE 8080 EXPOSE 8080
CMD ["java", "-jar", "app.jar"] CMD ["java", "-jar", "app.jar"]