tests: setup concurrency for lint and ci workflows

Author: josegonzalez

.github/workflows/ci.yaml

@@ -10,6 +10,10 @@ on:
     branches:
       - "main"
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     name: build

.github/workflows/lint.yaml

@@ -10,6 +10,10 @@ on:
     branches:
       - "main"
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   hadolint:
     name: hadolint