[image-provider]: replace bookworm image with nonroot alpine image

CHANGELOG.md

@@ -33,6 +33,8 @@ the release.
   ([2194](https://github.com/open-telemetry/opentelemetry-demo/pull/2194))
 * [shipping] refactor service to use actix-web and demo instrumentation library
   ([2214](https://github.com/open-telemetry/opentelemetry-demo/pull/2214))
+* [image-provider]: replace bookworm image with nonroot alpine image
+  ([2193](https://github.com/open-telemetry/opentelemetry-demo/pull/2193))
 
 ## 2.0.2
 

src/image-provider/Dockerfile

@@ -1,23 +1,28 @@
 # Copyright The OpenTelemetry Authors
 # SPDX-License-Identifier: Apache-2.0
 
-FROM nginx:1.27.0-otel
+FROM nginxinc/nginx-unprivileged:1.27.5-alpine3.21
 
-RUN apt-get update ; apt-get install lsb-release --no-install-recommends --no-install-suggests -y
+USER 0
 
-# This file is needed for nginx-module-otel to be found.
-RUN echo "deb [signed-by=/usr/share/keyrings/nginx-archive-keyring.gpg] http://nginx.org/packages/mainline/debian `lsb_release -cs` nginx" | tee /etc/apt/sources.list.d/nginx.list
+RUN printf "%s%s%s%s\n" \
+    "@nginx " \
+    "http://nginx.org/packages/mainline/alpine/v" \
+    `egrep -o '^[0-9]+\.[0-9]+' /etc/alpine-release` \
+    "/main" \
+    | tee -a /etc/apk/repositories
 
-RUN apt-get update ; apt-get install nginx-module-otel --no-install-recommends --no-install-suggests -y
+RUN apk update && \
+    apk add nginx-module-otel@nginx
 
-RUN mkdir /static
-COPY src/image-provider/static /static
+USER 101
+
+COPY src/image-provider/static/ /static/
+COPY src/image-provider/nginx.conf.template /nginx.conf.template
 
 EXPOSE ${IMAGE_PROVIDER_PORT}
 
 STOPSIGNAL SIGQUIT
 
-COPY src/image-provider/nginx.conf.template /nginx.conf.template
-
 # Start nginx
 CMD ["/bin/sh" , "-c" , "envsubst '$OTEL_COLLECTOR_HOST $IMAGE_PROVIDER_PORT $OTEL_COLLECTOR_PORT_GRPC $OTEL_SERVICE_NAME' < /nginx.conf.template > /etc/nginx/nginx.conf && cat  /etc/nginx/nginx.conf && exec nginx -g 'daemon off;'"]

src/image-provider/nginx.conf.template

@@ -1,5 +1,7 @@
 load_module modules/ngx_otel_module.so;
 
+pid /tmp/nginx.pid;
+
 events {
     worker_connections 1024;
 }