Add docker file

.gitea/workflows/deploy.yaml

@@ -7,16 +7,12 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    container:
+      image: docker:26-cli
     steps:
       - 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