diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index fd639ec..02185e5 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -1,6 +1,7 @@
+---
 name: Run tests
 
-on:
+on:  # yamllint disable-line rule:truthy
   push:
     branches: ['main']
   pull_request:
@@ -16,3 +17,8 @@ jobs:
       repository: colcon/colcon-notification
       # Use HEAD to find strategy.json file instead of the tip of colcon/ci
       setup-repository: ''
+  yamllint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: yamllint .
diff --git a/.github/workflows/pytest.yaml b/.github/workflows/pytest.yaml
index e41176e..2f5e604 100644
--- a/.github/workflows/pytest.yaml
+++ b/.github/workflows/pytest.yaml
@@ -1,6 +1,7 @@
+---
 name: Run tests
 
-on:
+on:  # yamllint disable-line rule:truthy
   workflow_call:
     inputs:
       codecov:
@@ -9,7 +10,8 @@ on:
         required: false
         type: boolean
       matrix-filter:
-        description: 'jq filter string indicating which configuration(s) should be included'
+        description: 'jq filter string indicating which configuration(s)
+          should be included'
         default: '.'
         required: false
         type: string
diff --git a/action.yaml b/action.yaml
index 2eb4ced..b4b2263 100644
--- a/action.yaml
+++ b/action.yaml
@@ -30,19 +30,32 @@ runs:
         echo ::endgroup::
 
         echo ::group::Run tests
-        python -m pytest --cov --cov-branch --cov-report xml:coverage.xml --cov-config setup.cfg
+        python -m pytest \
+          --cov --cov-branch \
+          --cov-report xml:coverage.xml \
+          --cov-config setup.cfg
         echo ::endgroup::
 
         echo ::group::Test publish
         # Run publish-python without uploading the results
         if [ -f publish-python.yaml ]; then
           PUBLISH_PYTHON=$(mktemp -d)
-          git clone https://github.com/dirk-thomas/publish-python.git $PUBLISH_PYTHON
+          pushd $PUBLISH_PYTHON
+          git clone https://github.com/dirk-thomas/publish-python.git .
+          popd
           python -m pip install -U PyYAML wheel
           python $PUBLISH_PYTHON/bin/publish-python wheel:pypi
           if [ ! -z "${{matrix.stdeb-check}}" ]; then
-            sudo apt install -y debhelper dh-python fakeroot python3-all python3-stdeb python3-yaml
-            DEB_BUILD_OPTIONS=nocheck /usr/bin/python3 $PUBLISH_PYTHON/bin/publish-python stdeb:packagecloud
+            sudo apt install \
+              debhelper \
+              dh-python \
+              fakeroot \
+              python3-all \
+              python3-stdeb \
+              python3-yaml \
+              -y
+            DEB_BUILD_OPTIONS=nocheck /usr/bin/python3 \
+              $PUBLISH_PYTHON/bin/publish-python stdeb:packagecloud
           else
             echo "Skipping stdeb test on non-Debian platform..."
           fi