feat: add concurrency control to GitHub Actions workflows

- Cancel previous CI runs when new commits are pushed to same branch/PR
- Cancel previous release runs when multiple tags are pushed
- Saves CI resources and provides faster feedback
- Uses workflow name + git ref as concurrency group identifier

Author: pedronauck

.github/workflows/ci.yml

@@ -6,6 +6,11 @@ on:
   pull_request:
     branches: [main, develop]
 
+# Cancel previous runs for the same workflow on the same branch/PR
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   GO_VERSION: "1.24"
 

.github/workflows/release.yml

@@ -5,6 +5,11 @@ on:
     tags:
       - "v*"
 
+# Cancel previous runs for the same workflow on the same tag
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   GO_VERSION: "1.24"