Add GitHub workflow for branch test, build and push

.github/main.workflow

@@ -0,0 +1,44 @@
+workflow "Publish branch" {
+  on = "push"
+  resolves = ["Is branch", "Push branch"]
+}
+
+action "Is branch" {
+  uses = "actions/bin/filter@master"
+  args = "ref refs/heads/*"
+}
+
+action "Test branch" {
+  needs = ["Is branch"]
+  uses = "docker://golang:1.10"
+  runs = "sh -c"
+  args = ["cp -a vendor/. /usr/local/go/src; go test -v ./..."]
+}
+
+action "Build branch" {
+  needs = ["Test branch"]
+  uses = "actions/docker/cli@master"
+  args = "build -t app -f Dockerfile.ci ."
+}
+
+action "Tag branch" {
+  needs = ["Build branch"]
+  uses = "actions/docker/cli@master"
+  args = "tag app ${DOCKER_IMAGE}:$(echo ${GITHUB_REF} | rev | cut -d/ -f1 | rev)-$(echo ${GITHUB_SHA} | head -c7)"
+  secrets = ["DOCKER_IMAGE"]
+}
+
+action "Login branch" {
+  needs = ["Tag branch"]
+  uses = "actions/docker/login@master"
+  secrets = ["DOCKER_USERNAME", "DOCKER_PASSWORD"]
+}
+
+action "Push branch" {
+  needs = ["Login branch"]
+  uses = "actions/docker/cli@master"
+  args = "push ${DOCKER_IMAGE}:$(echo ${GITHUB_REF} | rev | cut -d/ -f1 | rev)-$(echo ${GITHUB_SHA} | head -c7)"
+  secrets = ["DOCKER_IMAGE"]
+}
+
+