Add github workflow.

Author: mtwebster

.github/workflows/build.yml

@@ -0,0 +1,20 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  build:
+    uses: linuxmint/github-actions/.github/workflows/do-builds.yml@master
+    with:
+      commit_id: master
+      ############################## Comma separated list - like 'linuxmint/xapp, linuxmint/cinnamon-desktop'
+      dependencies:
+      ##############################
+

README.md

@@ -1,4 +1,6 @@
 # Sticky
+![build](https://github.com/linuxmint/sticky/actions/workflows/build.yml/badge.svg)
+
 Sticky is a note-taking app for the Linux desktop that simulates traditional "sticky note" style stationery on your desktop. Some of its features include basic text formatting (bold, italics, monospaced, etc.), spell-checking, a tray icon for controlling note visibility, color notes, manual and automatic backups, and a manager to organize your notes into groups. Sticky is written in Python, and uses the GTK3 toolkit
 
 ![img](https://linuxmint.com/pictures/screenshots/uma/sticky.png)