diff --git a/.github/linters/.markdown-lint.yml b/.github/linters/.markdown-lint.yml
index 5d7892a..ff9a68e 100644
--- a/.github/linters/.markdown-lint.yml
+++ b/.github/linters/.markdown-lint.yml
@@ -1,2 +1,3 @@
+---
 MD013:
   line_length: 500
diff --git a/.github/stale.yml b/.github/stale.yml
index dc90e5a..82c0d00 100644
--- a/.github/stale.yml
+++ b/.github/stale.yml
@@ -1,3 +1,4 @@
+---
 # Number of days of inactivity before an issue becomes stale
 daysUntilStale: 60
 # Number of days of inactivity before a stale issue is closed
diff --git a/.github/workflows/ci-remote-image.yaml b/.github/workflows/ci-remote-image.yaml
index 9ed0dc4..942901a 100644
--- a/.github/workflows/ci-remote-image.yaml
+++ b/.github/workflows/ci-remote-image.yaml
@@ -1,3 +1,4 @@
+---
 name: ci-remote-image
 
 on:
@@ -20,7 +21,8 @@ jobs:
         run: docker-compose up --detach
 
       - name: add autowizard file
-        run: docker cp .github/auto_wizard.json zammad-docker-compose_zammad-railsserver_1:/opt/zammad
+        run: docker cp .github/auto_wizard.json\
+             zammad-docker-compose_zammad-railsserver_1:/opt/zammad
 
       - name: run tests
         run: .github/tests.sh
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 9c019de..e84b41c 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -1,3 +1,4 @@
+---
 name: ci
 
 on:
@@ -56,10 +57,13 @@ jobs:
         run: .github/docker-image-build.sh
 
       - name: run docker-compose up
-        run: docker-compose -f docker-compose.yml -f docker-compose.override.yml -f docker-compose.override-local.yml up --detach
+        run: docker-compose -f docker-compose.yml\
+             -f docker-compose.override.yml\
+             -f docker-compose.override-local.yml up --detach
 
       - name: add autowizard file
-        run: docker cp .github/auto_wizard.json zammad-docker-compose_zammad-railsserver_1:/opt/zammad
+        run: docker cp .github/auto_wizard.json\
+             zammad-docker-compose_zammad-railsserver_1:/opt/zammad
 
       - name: run tests
         run: .github/tests.sh
diff --git a/docker-compose.override-local.yml b/docker-compose.override-local.yml
index 14baddf..f10bab4 100644
--- a/docker-compose.override-local.yml
+++ b/docker-compose.override-local.yml
@@ -1,3 +1,4 @@
+---
 version: '3'
 
 services:
diff --git a/docker-compose.override.yml b/docker-compose.override.yml
index f7888bb..8569e66 100644
--- a/docker-compose.override.yml
+++ b/docker-compose.override.yml
@@ -1,3 +1,4 @@
+---
 version: '3'
 services:
 
diff --git a/docker-compose.yml b/docker-compose.yml
index 621c6f9..1bb3692 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,3 +1,4 @@
+---
 version: '3'
 
 services:
diff --git a/rancher-compose.yml b/rancher-compose.yml
index bc49675..26e6fb3 100644
--- a/rancher-compose.yml
+++ b/rancher-compose.yml
@@ -1,3 +1,4 @@
+---
 version: '2'
 
 services: