Build and push docker images using Travis CI.

.travis.yml

@@ -0,0 +1,23 @@
+language: go
+
+go:
+  - "1.13"
+services:
+  - docker
+env:
+  global:
+    - TAG=$TRAVIS_BRANCH
+
+if: branch = master OR tag IS present
+
+before_script:
+  - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+  - make before_build
+
+script:
+  - make docker_build && make docker_push && make docker_manifest
+
+notifications:
+  email:
+    on_success: never # default: change
+    on_failure: always # default: always

Makefile

@@ -3,6 +3,9 @@ COMMIT        = $(shell git rev-parse --short HEAD)
 FULL_COMMIT   = $(shell git rev-parse HEAD)
 RELEASE_NOTES = $(shell git log ${LAST_TAG}..HEAD --oneline --decorate)
 DATE          = $(shell date +%Y-%m-%d)
+DOCKER_REPO   = wi1dcard/v2ray-exporter
+
+export DOCKER_CLI_EXPERIMENTAL=enabled
 
 lint:
 	golangci-lint run *.go
@@ -29,6 +32,17 @@ release: build
 	@ghr -u wi1dcard -b "${RELEASE_NOTES}" -c "${FULL_COMMIT}" "${TAG}" dist/
 
 docker_build: build
-	docker build --build-arg ARCH=amd64 -t "wi1dcard/v2ray-exporter:${TAG}" .
-	docker build --build-arg ARCH=arm64 -t "wi1dcard/v2ray-exporter:${TAG}-arm64" .
-	docker build --build-arg ARCH=arm -t "wi1dcard/v2ray-exporter:${TAG}-arm" .
+	docker build --build-arg ARCH=amd64 -t "${DOCKER_REPO}:${TAG}-amd64" .
+	docker build --build-arg ARCH=arm64 -t "${DOCKER_REPO}:${TAG}-arm64" .
+	docker build --build-arg ARCH=arm -t "${DOCKER_REPO}:${TAG}-arm" .
+
+docker_push: check_tag
+	docker push "${DOCKER_REPO}:${TAG}-amd64"
+	docker push "${DOCKER_REPO}:${TAG}-arm64"
+	docker push "${DOCKER_REPO}:${TAG}-arm"
+
+docker_manifest: check_tag
+	docker manifest create --amend "${DOCKER_REPO}:${TAG}" "${DOCKER_REPO}:${TAG}-amd64" "${DOCKER_REPO}:${TAG}-arm64" "${DOCKER_REPO}:${TAG}-arm"
+	docker manifest annotate "${DOCKER_REPO}:${TAG}" "${DOCKER_REPO}:${TAG}-arm64" --os linux --arch arm64
+	docker manifest annotate "${DOCKER_REPO}:${TAG}" "${DOCKER_REPO}:${TAG}-arm" --os linux --arch arm
+	docker manifest push "${DOCKER_REPO}:${TAG}"