ci(docker): add concurrency group for docker

Interactions with tags and publishing container images should be purely
sequential. Limit job concurrency to prevent any issues with multiple
rapid updates to docker components.

Signed-off-by: Randolph Sapp <rs@ti.com>

Author: StaticRocket

.github/workflows/docker.yml

@@ -7,6 +7,10 @@ on:  # yamllint disable-line rule:truthy
       - 'docker/**'
       - requirements.txt
 
+concurrency:
+  group: docker
+  cancel-in-progress: true
+
 env:
   REGISTRY: ghcr.io
   IMAGE_NAME: ${{ github.repository }}