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