Add concurrency to GitHub workflows

Enable concurrency across workflows to avoid overlapping runs: add a concurrency group (${ { github.workflow } }-${ { github.ref } }) with cancel-in-progress:true to .github/workflows/codeql-analysis.yml, .github/workflows/publish.yml, and .github/workflows/validate.yml. Also remove an extraneous blank line in the CodeQL workflow. This prevents duplicate CI runs for the same branch/ref.

Author: alegauss

.github/workflows/codeql-analysis.yml

@@ -10,15 +10,16 @@
 # supported CodeQL languages.
 #
 name: "CodeQL Advanced"
-
 on:
   push:
     branches: ["2026.1"]
   pull_request:
     branches: ["2026.1"]
   schedule:
     - cron: "28 17 * * 3"
-
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 jobs:
   analyze:
     name: Analyze (${{ matrix.language }})

.github/workflows/publish.yml

@@ -12,6 +12,9 @@ on:
   push:
     branches:
       - main
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 jobs:
   publish:
     runs-on: ubuntu-latest

.github/workflows/validate.yml

@@ -13,6 +13,9 @@ on:
     branches: ["main", "2026.1"]
   pull_request:
     types: [opened, synchronize, reopened]
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 jobs:
   validate:
     runs-on: ubuntu-latest