Fix scope of user srv build in rolldice example

CHANGELOG.md

@@ -22,6 +22,7 @@ OpenTelemetry Go Automatic Instrumentation adheres to [Semantic Versioning](http
 ### Fixed
 
 - Fix `uint32` bounding on 32 bit architectures in the `go.opentelemetry.io/auto/sdk` module. ([#2810](https://github.com/open-telemetry/opentelemetry-go-instrumentation/pull/2810))
+- Fix `go.opentelemetry.io/auto/examples/rolldice` build. ([#2894](https://github.com/open-telemetry/opentelemetry-go-instrumentation/pull/2894))
 
 ## [v0.23.0/v1.2.0] - 2025-09-10
 

examples/rolldice/docker-compose.yaml

@@ -7,12 +7,12 @@ services:
   jaeger:
     image: jaegertracing/jaeger:2.11.0@sha256:b585df1b6299bbbd16bf7c679da30389349736e4b6bc8f4f500142a75bf26ca8
     ports:
-      - "16686:16686"   # Web HTTP
+      - "16686:16686" # Web HTTP
     restart: unless-stopped
   user:
     build:
-      context: ./user/
-      dockerfile: ./Dockerfile
+      context: ../../
+      dockerfile: ./examples/rolldice/user/Dockerfile
     pid: "host"
     ports:
       - "8082:8082"

examples/rolldice/user/Dockerfile

@@ -1,9 +1,11 @@
 FROM golang:1.25.1@sha256:d7098379b7da665ab25b99795465ec320b1ca9d4addb9f77409c4827dc904211
-WORKDIR /usr/src/user
+WORKDIR /usr/src/go.opentelemetry.io/auto/examples/rolldice/user
+# Use the local SDK copy.
+COPY ./sdk /usr/src/go.opentelemetry.io/auto/sdk
 # Copy go.mod for better layer caching
-COPY ./go.mod ./go.sum ./
+COPY ./examples/rolldice/user/go.mod ./examples/rolldice/user/go.sum ./
 RUN --mount=type=cache,target=/go/pkg go mod download && go mod verify
-COPY . .
+COPY ./examples/rolldice/user/ ./
 RUN --mount=type=cache,target=/root/.cache/go-build \
     --mount=type=cache,target=/go/pkg \
     go build -v -o /usr/local/bin/user ./server/...