Backport CI to r1 (#5)

* Add a github-actions-based CI (#1)

(cherry picked from commit 2fa668c)

* [CI] Fix setting image-name (#3)

(cherry picked from commit 2c0aaa1)

.github/workflows/ci.yml

@@ -0,0 +1,18 @@
+name: CI
+on:
+  push:
+    branches:
+      - main
+      - r[1-9]
+  pull_request:
+    branches:
+      - main
+      - r[1-9]
+jobs:
+  build-and-push-activemq-broker:
+    name: Build and push activemq-broker
+    uses: eu-nebulous/github-actions/.github/workflows/build-and-push-container-image.yml@main
+    with:
+      context: docker
+      image-name: activemq-broker
+    secrets: inherit