diff --git a/.github/workflows/github-actions-workflows.yml b/.github/workflows/github-actions-workflows.yml
index a8816bf..aebb806 100644
--- a/.github/workflows/github-actions-workflows.yml
+++ b/.github/workflows/github-actions-workflows.yml
@@ -17,3 +17,13 @@ jobs:
         uses: actions/checkout@v3
       - name: Check GitHub Actions workflows linting.
         run: earthly +check-github-actions-workflows-linting
+  formatting:
+    name: Formatting
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download Earthly v0.8.6.
+        run: "sudo /bin/sh -c 'wget https://github.com/earthly/earthly/releases/download/v0.8.6/earthly-linux-amd64 -O /usr/local/bin/earthly && chmod +x /usr/local/bin/earthly'"
+      - name: Checkout code.
+        uses: actions/checkout@v3
+      - name: Check formatting.
+        run: earthly +check-yaml-formatting
diff --git a/Earthfile b/Earthfile
index be2d561..8a83415 100644
--- a/Earthfile
+++ b/Earthfile
@@ -33,6 +33,24 @@ check-conventional-commits-linting:
     RUN ./ci/check-conventional-commits-linting.sh --from-reference "${from_reference}"
 
 
+yaml-formatting-base:
+    FROM +golang-base
+    RUN go install github.com/google/yamlfmt/cmd/yamlfmt@v0.10.0
+    COPY ".yamlfmt" "./"
+    DO +COPY_CI_DATA
+
+
+check-yaml-formatting:
+    FROM +yaml-formatting-base
+    RUN ./ci/check-yaml-formatting.sh
+
+
+fix-yaml-formatting:
+    FROM +yaml-formatting-base
+    RUN ./ci/fix-yaml-formatting.sh
+    SAVE ARTIFACT ".github/" AS LOCAL "./"
+
+
 check-github-actions-workflows-linting:
     FROM golang:1.20.13
     RUN go install github.com/rhysd/actionlint/cmd/actionlint@v1.6.26
diff --git a/ci/check-yaml-formatting.sh b/ci/check-yaml-formatting.sh
new file mode 100755
index 0000000..d39cb5a
--- /dev/null
+++ b/ci/check-yaml-formatting.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+set -o errexit
+set -o xtrace
+
+yamlfmt -lint -dstar .github/**/*
diff --git a/ci/fix-yaml-formatting.sh b/ci/fix-yaml-formatting.sh
new file mode 100755
index 0000000..7f5c712
--- /dev/null
+++ b/ci/fix-yaml-formatting.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env sh
+
+set -o errexit
+set -o xtrace
+
+yamlfmt -dstar ./github/**/*