feat: multi-arch Docker image.

.travis.yml

@@ -23,6 +23,9 @@ before_install:
   # Install linters and misspell
   - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s -- -b $GOPATH/bin ${GOLANGCI_LINT_VERSION}
   - golangci-lint --version
+  # Install Docker image multi-arch builder
+  - curl -sfL https://raw.githubusercontent.com/ldez/seihon/master/godownloader.sh | bash -s -- -b "${GOPATH}/bin" ${SEIHON_VERSION}
+  - seihon --version
 
 install:
   - go mod tidy
@@ -33,3 +36,17 @@ install:
 script:
   - make
   - make image
+
+before_deploy:
+  - >
+    if ! [ "$BEFORE_DEPLOY_RUN" ]; then
+      export BEFORE_DEPLOY_RUN=1;
+      echo "${DOCKER_PASSWORD}" | docker login -u "${DOCKER_USERNAME}" --password-stdin
+    fi
+
+deploy:
+  - provider: script
+    skip_cleanup: true
+    script: make publish-images
+    on:
+      tags: true

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.13-alpine as builder
+FROM golang:1-alpine as builder
 
 RUN apk --no-cache --no-progress add git ca-certificates tzdata make \
     && update-ca-certificates \

Makefile

@@ -1,4 +1,6 @@
-.PHONY: default build image check
+.PHONY: default build image check publish-images
+
+TAG_NAME := $(shell git tag -l --contains HEAD)
 
 default: check test build
 
@@ -13,3 +15,6 @@ image:
 
 check:
 	golangci-lint run
+
+publish-images:
+	seihon publish -v "$(TAG_NAME)" -v "latest" --image-name containous/whoami --dry-run=false

tmpl.Dockerfile

@@ -0,0 +1,24 @@
+FROM golang:1-alpine as builder
+
+RUN apk --no-cache --no-progress add git ca-certificates tzdata make \
+    && update-ca-certificates \
+    && rm -rf /var/cache/apk/*
+
+WORKDIR /go/whoami
+
+# Download go modules
+COPY go.mod .
+COPY go.sum .
+RUN GO111MODULE=on GOPROXY=https://proxy.golang.org go mod download
+
+COPY . .
+RUN GOARCH={{ .GoARCH }} GOARM={{ .GoARM }} make build
+
+FROM scratch
+
+COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=builder /go/whoami/whoami .
+
+ENTRYPOINT ["/whoami"]
+EXPOSE 80