diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index a72c2e3..1a00e3f 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -1,9 +1,9 @@
 name: Unit tests
 on:
- push:
-   branches:
-     - master
- pull_request:
+  push:
+    branches:
+      - master
+  pull_request:
 
 jobs:
   unit-tests:
diff --git a/Earthfile b/Earthfile
index f762a94..e195ad4 100644
--- a/Earthfile
+++ b/Earthfile
@@ -63,3 +63,8 @@ iso:
     RUN sha256sum $ISO_NAME.iso > $ISO_NAME.iso.sha256
     SAVE ARTIFACT /build/$ISO_NAME.iso iso AS LOCAL build/$ISO_NAME.iso
     SAVE ARTIFACT /build/$ISO_NAME.iso.sha256 sha256 AS LOCAL build/$ISO_NAME.iso.sha256
+
+yamllint:
+    FROM cytopia/yamllint
+    COPY . .
+    RUN yamllint .github/workflows/