feat(backend/infra): update Woodpecker config for registry.lrhdev.dk

- Configure docker-build stage to push to registry.lrhdev.dk
- Add deploy stage with SSH deployment to deutsch.lrhdev.dk
- Add detailed comments for Woodpecker configuration
- Document required secrets (docker_username, docker_password, SSH_PRIVATE_KEY)

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

.woodpecker.yml

@@ -28,8 +28,8 @@ pipeline:
     settings:
       dockerfile: GermanApp/Dockerfile
       context: GermanApp
-      repo: git.lrhdev.dk/lasserh/deutschlernen
-      registry: git.lrhdev.dk
+      registry: registry.lrhdev.dk
+      repo: registry.lrhdev.dk/lasserh/deutschlernen
       tags:
         - latest
         - ${CI_COMMIT_SHA:0:8}
@@ -45,13 +45,19 @@ pipeline:
       status:
         - success
 
-  # Deploy stage (placeholder - customize for your deployment)
+  # Deploy stage
   deploy:
     image: alpine
     commands:
-      - echo "Deployment step"
-      - echo "Add your deployment commands here"
-      - echo "Example: ssh user@deutsch.lrhdev.dk 'cd /path/to/app && docker-compose pull && docker-compose up -d'"
+      - echo "Deploying to deutsch.lrhdev.dk..."
+      - apk add --no-cache openssh-client
+      - mkdir -p ~/.ssh
+      - echo "$SSH_PRIVATE_KEY" > ~/.ssh/id_rsa
+      - chmod 600 ~/.ssh/id_rsa
+      - ssh-keyscan deutsch.lrhdev.dk >> ~/.ssh/known_hosts
+      - ssh root@deutsch.lrhdev.dk "cd /path/to/app && docker-compose pull backend && docker-compose up -d backend"
+    secrets:
+      - SSH_PRIVATE_KEY
     when:
       # Only deploy on main branch after successful docker-build
       branch:
@@ -59,7 +65,29 @@ pipeline:
       status:
         - success
 
-# Woodpecker uses YAML similar to Drone CI
-# Secrets need to be configured in the Woodpecker UI:
-# - docker_username: Your Docker registry username
-# - docker_password: Your Docker registry password/token
+# ============================================
+# WOODPECKER CONFIGURATION NOTES
+# ============================================
+# 
+# Required Secrets (configure in Woodpecker UI):
+# --------------------------------------------
+# 1. docker_username - Your registry username for registry.lrhdev.dk
+# 2. docker_password - Your registry password for registry.lrhdev.dk
+# 3. SSH_PRIVATE_KEY - SSH private key for deploying to deutsch.lrhdev.dk
+#
+# Registry Configuration:
+# -----------------------
+# - Registry URL: registry.lrhdev.dk
+# - Repository: registry.lrhdev.dk/lasserh/deutschlernen
+# - Images will be tagged as: latest and <short-commit-hash>
+#
+# Deployment:
+# ----------
+# The deploy stage connects via SSH to deutsch.lrhdev.dk and:
+# 1. Pulls the latest backend image
+# 2. Restarts the backend container
+#
+# Customize the deploy command to match your docker-compose setup.
+# If you use a different path or service name, update the ssh command.
+#
+# ============================================