Add docker file

.gitea/workflows/deploy.yaml

@@ -11,6 +11,12 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      - name: Install docker CLI
+        run: |
+          apt-get update
+          apt-get install -y docker.io
+          docker version || true
+
       - name: Build docker image
         run: |
           docker build -t mkdocs-builder -f ci/mkdocs/Dockerfile ci/mkdocs