use actions/checkout instead of 'git clone'

Author: kare

action.yaml

@@ -1,7 +1,7 @@
 name: 'Streamr Docker Dev Action'
 description: 'Start Streamr Docker Stack'
 branding:
-  icon: 'layers'  
+  icon: 'layers'
   color: 'orange'
 inputs:
   services-to-start:
@@ -12,8 +12,11 @@ inputs:
 runs:
   using: "composite"
   steps:
+    - uses: actions/[email protected]
+      with:
+        repository: streamr-dev/streamr-docker-dev
+        path: streamr-docker-dev
     - run: |
-          git clone --depth 1 https://github.com/streamr-dev/streamr-docker-dev.git
           cp streamr-docker-dev/streamr-docker-dev/bin.sh streamr-docker-dev/streamr-docker-dev/streamr-docker-dev
           echo "$(pwd)/streamr-docker-dev/streamr-docker-dev" >> $GITHUB_PATH
       shell: bash