fix(release): stage the sidecar jar at the renamed embed path

.goreleaser.yaml

@@ -5,10 +5,10 @@ project_name: sanderling
 before:
   hooks:
     # The Go binary embeds the sidecar fat JAR via //go:embed gated by the
-    # `withsidecar` build tag. Rebuild the JAR and stage it at the embed
-    # path so the `go build` below picks up fresh bytes.
-    - make sidecar
-    - sh -c 'mkdir -p internal/sidecar/assets && cp sidecar/build/libs/sidecar-all.jar internal/sidecar/assets/sidecar-all.jar'
+    # `withsidecar` build tag. The Makefile target rebuilds the JAR and stages
+    # it at the embed path, so the `go build` below picks up fresh bytes and
+    # that path stays spelled out in exactly one place.
+    - make sidecar-embed
 
 builds:
   - id: sanderling

Makefile

@@ -29,7 +29,7 @@ WEB_DIST := replay-ui/dist
 
 GOLINES := $(shell $(GO) env GOPATH)/bin/golines
 
-.PHONY: bootstrap proto sidecar sanderling sanderling-web sanderling-android sanderling-ios install test test-go test-browser test-companion test-kotlin test-spec-api spec-typecheck web-test web-typecheck web-build web-dev replay-dev docs clean release-cli release-npm-dry fmt fmt-go fmt-kotlin fmt-ts fmt-swift
+.PHONY: bootstrap proto sidecar sidecar-embed sanderling sanderling-web sanderling-android sanderling-ios install test test-go test-browser test-companion test-kotlin test-spec-api spec-typecheck web-test web-typecheck web-build web-dev replay-dev docs clean release-cli release-npm-dry fmt fmt-go fmt-kotlin fmt-ts fmt-swift
 
 bootstrap:
 	$(GO) mod download
@@ -42,6 +42,10 @@ proto:
 
 sidecar: $(SIDECAR_JAR)
 
+# Stages the JAR where //go:embed expects it. Release tooling calls this rather
+# than copying the JAR itself, so the embed path is spelled out in one place.
+sidecar-embed: $(SIDECAR_EMBED)
+
 sanderling: $(SANDERLING_BIN)
 
 $(SANDERLING_BIN): $(SIDECAR_EMBED) $(COMPANION_EMBED) $(RUNNER_EMBED) web-build