agent: verify version from plugin metadata

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

Author: crazy-max

pkg/agent/deb/rules

@@ -12,7 +12,7 @@ override_dh_auto_build:
 		go build -trimpath -ldflags="-w -X 'github.com/docker/docker-agent/pkg/version.Version=$(VERSION)' -X 'github.com/docker/docker-agent/pkg/version.Commit=$(REVISION)'" -o /usr/libexec/docker/cli-plugins/docker-agent .
 
 override_dh_auto_test:
-	ver="$$(/usr/libexec/docker/cli-plugins/docker-agent version | grep 'docker-agent version' | awk '{print $$3}')"; \
+	ver="$$(/usr/libexec/docker/cli-plugins/docker-agent docker-cli-plugin-metadata | awk '{ gsub(/[\",:]/,\"\")}; $$1 == \"Version\" { print $$2 }')"; \
 		test "$$ver" = "$(VERSION)" && echo "PASS: docker-agent version OK" || (echo "FAIL: docker-agent version ($$ver) did not match" && exit 1)
 
 override_dh_strip: