[cmd/golden] add a Docker image (#39771)

Adds a docker image for the new golden cmd executable, allowing to port
this utility to make assertions in Kubernetes environments.

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: atoulme

.chloggen/golden_docker.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: cmd/golden
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add a docker image for golden
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [39662]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

Makefile

@@ -360,6 +360,13 @@ docker-telemetrygen:
 	cd cmd/telemetrygen && docker build --platform linux/$(GOARCH) --build-arg="TARGETOS=$(GOOS)" --build-arg="TARGETARCH=$(GOARCH)" -t telemetrygen:latest .
 	rm cmd/telemetrygen/telemetrygen_*
 
+.PHONY: docker-golden
+docker-golden:
+	GOOS=linux GOARCH=$(GOARCH) $(MAKE) golden
+	cp bin/golden_* cmd/golden/
+	cd cmd/golden && docker build --platform linux/$(GOARCH) --build-arg="TARGETOS=$(GOOS)" --build-arg="TARGETARCH=$(GOARCH)" -t golden:latest .
+	rm cmd/golden/golden_*
+
 .PHONY: generate
 generate: install-tools
 	PATH="$(ROOT_DIR).tools:$$PATH" $(MAKE) for-all CMD="$(GOCMD) generate ./..."

cmd/golden/Dockerfile

@@ -0,0 +1,16 @@
+FROM alpine:latest@sha256:a8560b36e8b8210634f77d9f7f9efd7ffa463e380b75e2e74aff4511df3ef88c AS certs
+RUN apk --update add ca-certificates
+
+FROM scratch
+
+ARG USER_UID=10001
+ARG USER_GID=10001
+USER ${USER_UID}:${USER_GID}
+
+ARG TARGETOS
+ARG TARGETARCH
+
+COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+COPY ./golden_${TARGETOS}_${TARGETARCH} /golden
+
+ENTRYPOINT ["/golden"]