ADD example3

.github/workflows/example3.yml

@@ -0,0 +1,22 @@
+name: Mosquitto Docker Action (example 3)
+
+on: [push]
+
+jobs:
+    publish-messages:
+        runs-on: ubuntu-latest
+
+        steps:
+        - name: Checkout repository
+          uses: actions/checkout@v2
+
+        - name: Run Mosquitto container
+          run: docker run -d --name mosquitto -p 1883:1883 -v $(pwd)/test/functionalTest/mosquittoConf:/mosquitto/config eclipse-mosquitto
+
+        - name: Publish messages
+          run: |
+                docker logs mosquitto
+                docker exec mosquitto mosquitto_pub -h localhost -t test/topic -m "Hello, World!"
+                docker exec mosquitto mosquitto_pub -h localhost -t test/topic -m "Another message"
+                docker exec mosquitto mosquitto_pub -h localhost -t test/topic -u user1 -P xxxx -m "Message on auth user"
+                docker logs mosquitto