add workflows

.gitea/workflows/demo.yml

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+name: Test
+run-name: ${{ gitea.actor }} greets Habr!
+on: [push]
+
+jobs:
+  print-content:
+    name: Print content
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout code
+        uses: actions/checkout@v4
+      - name: list directory contents
+        run: ls -la

.gitea/workflows/docker_build_demo.yml

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+name: Docker Build Demo
+
+# Optional run-name, visible in the Gitea Actions UI
+run-name: ${{ github.actor }} is building a Docker image 🚀
+
+# Trigger the workflow on push events
+on: push
+
+# Define jobs to run
+jobs:
+  Build-Docker-Image:
+    # Specify the runner environment
+    runs-on: ubuntu-latest
+    steps:
+      # Step 1: Checkout the repository code
+      - name: Checkout Code
+        uses: actions/checkout@v4
+
+      # Step 2: Build the Docker image
+      - name: Build Docker image
+        run: |
+          docker build -t my-image:latest .
+
+      # Step 3: Login to a Docker Registry (e.g., Docker Hub or Gitea's registry)
+      - name: Login to Docker Registry
+        # Use Gitea secrets for credentials for security
+        run: echo "${{ secrets.DOCKERPWD }}" | docker login -u "${{ secrets.DOCKERUSER }}" --password-stdin
+        
+      # Step 4: Tag and Push the Docker image
+      - name: Push Docker image
+        run: |
+          docker tag my-image:latest "${{ secrets.DOCKERUSER }}/dev:latest"
+          docker push "${{ secrets.DOCKERUSER }}/dev:latest"