add setup docker action

setup-docker/README.md

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+By default, many Gitea runner environments do not include a Docker installation.<br/>
+This can be problematic because Docker is required by many container-related workflows, including building, tagging, and publishing container images.
+
+This action installs the required dependencies before invoking the underlying action, making it easier to run Docker-based workflows on Gitea runners without duplicating setup steps in every repository.
+
+
+```yaml
+- name: Setup docker
+  uses: https://git.claeyscloud.com/david/gitea-actions/setup-docker@main
+``

setup-docker/action.yaml

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+name: Setup Docker
+
+description: |
+        Install Docker on the runner environment
+        This action uses Docker's official convenience installation script at https://get.docker.com/
+
+runs:
+  using: composite
+
+  steps:
+    - name: Install Docker
+      shell: bash
+      run: |
+        echo "Checking docker installation"
+        if command -v docker &> /dev/null; then
+            echo "Docker installation found"
+        else
+            echo "Docker installation not found. Docker will be installed"
+            curl -fsSL https://get.docker.com | sh
+            echo "Docker installed:"
+            docker --version
+        fi