ci: allow publish from branch (#228)

.github/workflows/publish.yaml

@@ -18,6 +18,10 @@ on:
       stateCommit:
         description: 'The images will have cheques by the traffic generation'
         default: 'false'
+      branch:
+        description: 'Branch of this repo to build (default "master")'
+        default: master
+        required: false
   push:
     branches:
       - 'master'
@@ -45,6 +49,8 @@ jobs:
 
       - name: Checkout
         uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.inputs.branch }}
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2