add concurrency to some of the workflows

Author: dbasunag

.github/workflows/size-labeler.yml

@@ -11,6 +11,10 @@ jobs:
   add-pr-size-label:
     runs-on: ubuntu-latest
 
+    concurrency:
+      group: ${{ github.workflow }}-${{github.event.pull_request.number}}
+      cancel-in-progress: true
+
     steps:
       - uses: actions/checkout@v5
 

.github/workflows/tox-tests.yml

@@ -8,6 +8,10 @@ jobs:
   tox-tests:
     runs-on: ubuntu-latest
 
+    concurrency:
+      group: ${{ github.workflow }}-${{github.event.pull_request.number}}
+      cancel-in-progress: true
+
     steps:
     - uses: actions/checkout@v5
 

.github/workflows/verify_build_container.yml

@@ -8,6 +8,10 @@ jobs:
   build:
     runs-on: ubuntu-latest
 
+    concurrency:
+      group: ${{ github.workflow }}-${{github.event.pull_request.number}}
+      cancel-in-progress: true
+
     steps:
       - name: Checkout Pull Request Branch
         uses: actions/checkout@v5