multi-arch travis build

.travis

@@ -0,0 +1,27 @@
+sudo: required
+language: go
+
+go:
+  - 1.9.x
+
+services:
+  - docker
+
+addons:
+  apt:
+    packages:
+      - docker-ce
+
+before_install:
+  - go get github.com/estesp/manifest-tool
+
+script:
+  - make build docker-build
+
+after_success:
+  - if [ -z "DOCKER_USER" ]; then
+      echo "PR build, skipping Docker Hub push";
+    else
+      docker login -u $DOCKER_USER -p $DOCKER_PASS;
+      make docker-push;
+    fi

Makefile

@@ -2,17 +2,13 @@
 #
 # The release version is controlled from pkg/version
 #
-# Prerequsitesx:
-
+# Prerequisites:
+# 1) docker login (change the DOCKER_REPOSITORY to match your Docker Hub user)
+# 2) go get github.com/estesp/manifest-tool
 
 EMPTY:=
 SPACE:=$(EMPTY) $(EMPTY)
 COMMA:=$(EMPTY),$(EMPTY)
-
-ifeq (, $(shell which manifest-tool))
-    $(error "No manifest-tool in $$PATH, install with: go get github.com/estesp/manifest-tool")
-endif
-
 DOCKER_REPOSITORY:=stefanprodan
 NAME:=podinfo
 VERSION:=$(shell grep 'VERSION' pkg/version/version.go | awk '{ print $$4 }' | tr -d '"')
@@ -21,9 +17,6 @@ GITCOMMIT:=$(shell git describe --dirty --always)
 LINUX_ARCH:=amd64 arm arm64 ppc64le
 PLATFORMS:=$(subst $(SPACE),$(COMMA),$(foreach arch,$(LINUX_ARCH),linux/$(arch)))
 
-all:
-	@echo Use the 'release' target to start a release
-
 release: build tar
 
 docker: docker-build docker-push