Add concurrency and permissions

Author: smonicas

.github/workflows/main.yml

@@ -1,13 +1,18 @@
 name: CI
-permissions:
-  contents: read
 
 on:
   push:
     branches: [master]
   pull_request:
     branches: [master]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
 jobs:
   lint:
     runs-on: ubuntu-slim

.github/workflows/pip-audit.yml

@@ -8,6 +8,13 @@ on:
   schedule:
     - cron: "0 12 * * *"
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
 jobs:
   pip-audit:
     runs-on: ubuntu-slim