Add github actions

Author: jhh

.github/main.workflow

@@ -0,0 +1,24 @@
+workflow "check build on push" {
+  on = "push"
+  resolves = ["gradle build"]
+}
+
+action "gradle build" {
+  uses = "MrRamych/gradle-actions@12909e7ccd3ed7e3b39c2f3ac350d6849eabeaf3"
+  args = "build"
+}
+
+workflow "process pull request" {
+  on = "pull_request"
+  resolves = ["post gif on fail", "branch cleanup"]
+}
+
+action "post gif on fail" {
+  uses = "jessfraz/shaking-finger-action@master"
+  secrets = ["GITHUB_TOKEN"]
+}
+
+action "branch cleanup" {
+  uses = "jessfraz/branch-cleanup-action@master"
+  secrets = ["GITHUB_TOKEN"]
+}