Package and ship frontend independenlty (prometheus#2893)

Enable frontend consumption by downstreams, like debian and nixos

Signed-off-by: Julien Pivotto <[email protected]>

.circleci/config.yml

@@ -36,6 +36,13 @@ jobs:
       - run: git diff --exit-code
       - store_test_results:
           path: ~/test-results
+      - run:
+          name: Save assets
+          command: make assets-tarball
+      - persist_to_workspace:
+          root: .
+          paths:
+            - .tarballs
   test:
     docker:
       # Whenever the Go version is updated here, .promu.yml should also be updated.

Makefile

@@ -29,6 +29,10 @@ build-all: assets apiv2 build
 .PHONY: assets
 assets: asset/assets_vfsdata.go
 
+.PHONY: assets-tarball
+assets-tarball: ui/app/script.js ui/app/index.html
+	scripts/package_assets.sh
+
 asset/assets_vfsdata.go: ui/app/script.js ui/app/index.html ui/app/lib template/default.tmpl template/email.tmpl
 	GO111MODULE=$(GO111MODULE) $(GO) generate $(GOOPTS) ./asset
 	@$(GOFMT) -w ./asset

scripts/package_assets.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+#
+# compress static assets
+
+set -euo pipefail
+
+version="$(< VERSION)"
+mkdir -p .tarballs
+tar czf .tarballs/alertmanager-web-ui-${version}.tar.gz ui/app/script.js ui/app/index.html