Add GitHub release workflow

.github/main.workflow

@@ -35,3 +35,38 @@ action "Push branch" {
 }
 
 
+workflow "Publish release" {
+  on = "release"
+  resolves = ["Push release"]
+}
+
+action "Is release" {
+  uses = "actions/bin/filter@master"
+  args = "ref refs/tags/v*"
+}
+
+action "Test and build release" {
+  needs = ["Is release"]
+  uses = "actions/docker/cli@master"
+  args = "build -t app -f Dockerfile.ci ."
+}
+
+action "Login release" {
+  needs = ["Test and build release"]
+  uses = "actions/docker/login@master"
+  secrets = ["DOCKER_USERNAME", "DOCKER_PASSWORD"]
+}
+
+action "Tag release" {
+  needs = ["Login release"]
+  uses = "actions/docker/cli@master"
+  args = "tag app ${DOCKER_IMAGE}:$(echo ${GITHUB_REF} | rev | cut -d/ -f1 | rev)"
+  secrets = ["DOCKER_IMAGE"]
+}
+
+action "Push release" {
+  needs = ["Tag release"]
+  uses = "actions/docker/cli@master"
+  args = "push ${DOCKER_IMAGE}:$(echo ${GITHUB_REF} | rev | cut -d/ -f1 | rev)"
+  secrets = ["DOCKER_IMAGE"]
+}