chore: Cancel in-progress GitHub Actions

See
https://turso.tech/blog/simple-trick-to-save-environment-and-money-when-using-github-actions.

.github/workflows/govulncheck.yml

@@ -10,6 +10,9 @@ on:
     - v*
   schedule:
   - cron: 2 2 * * *
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
 jobs:
   govulncheck:
     runs-on: ubuntu-22.04

.github/workflows/installer.yml

@@ -6,6 +6,9 @@ on:
   push:
     branches:
     - master
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
 env:
   SHA: ${{ github.event_name == 'push' && github.sha || github.event.pull_request.head.sha }}
 jobs:

.github/workflows/lock-threads.yml

@@ -10,7 +10,8 @@ permissions:
   pull-requests: write
 
 concurrency:
-  group: lock-threads
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
 
 jobs:
   action:

.github/workflows/main.yml

@@ -10,6 +10,9 @@ on:
     - v*
   schedule:
   - cron: 32 2 * * *
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
 env:
   ACTIONLINT_VERSION: 1.7.3 # https://github.com/rhysd/actionlint/releases
   AGE_VERSION: 1.2.0 # https://github.com/FiloSottile/age/releases