diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index afa2395..e800d48 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -2,11 +2,20 @@ name: Build
 
 on:
   push:
+    branches: [main]
+    paths-ignore: ['**.md', 'docs/**']
   pull_request:
+    paths-ignore: ['**.md', 'docs/**']
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
 
 jobs:
   build:
+    if: github.event_name != 'pull_request' || !github.event.pull_request.draft
     runs-on: ubuntu-latest
+    timeout-minutes: 15
     steps:
       - uses: actions/checkout@v4
       - name: Leak check (emails and build output; private terms are only checked locally)
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 57fcc3d..afe91c6 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -8,9 +8,14 @@ on:
 permissions:
   contents: write
 
+concurrency:
+  group: release-${{ github.ref }}
+  cancel-in-progress: false
+
 jobs:
   release:
     runs-on: ubuntu-latest
+    timeout-minutes: 20
     steps:
       - uses: actions/checkout@v4
       - name: Leak check