chore: Add concurrency rules for workflows

- test
- Electronegativity
- linter

Signed-off-by: Sebastian Malton <sebastian@malton.name>

.github/workflows/electronegativity.yml

@@ -6,6 +6,9 @@ on:
   pull_request:
     branches:
       - master
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
 jobs:
   build_job:
     runs-on: ubuntu-latest

.github/workflows/linter.yml

@@ -1,6 +1,9 @@
 name: Lint Repo
 on:
   - pull_request
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
 jobs:
   build:
     name: Lint

.github/workflows/test.yml

@@ -6,6 +6,9 @@ on:
   push:
     branches:
       - master
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
 jobs:
   integration-test:
     name: integration tests on ${{ matrix.os }}