feat: Add main application views and structure

- Implemented CreateInstanceView for creating new instances.
- Added HostsView for managing SSH hosts with CRUD operations.
- Created InstancesView for displaying and managing instances.
- Developed LogsView for viewing operation logs.
- Introduced SecretsView for managing secrets associated with hosts.
- Established SettingsView for configuring application settings.
- Created MainWindow as the main application window with navigation.
- Added app manifest and configuration files for logging and settings.

.gitea/workflows/docker-publish.yml

@@ -0,0 +1,55 @@
+# Gitea Actions workflow: build Docker image and push to a container registry
+# Place secrets in the repository settings: REGISTRY (host[:port]), IMAGE_NAME, DOCKER_USERNAME, DOCKER_PASSWORD
+
+name: Build and Publish Docker Image
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch: {}
+
+jobs:
+  build-and-push:
+    # Use an appropriate runner that has Docker available (self-hosted runner)
+    runs-on: self-hosted
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Build and push image
+        # run everything in a single shell step to keep tag calculation simple
+        run: |
+          set -euo pipefail
+          REGISTRY="${{ secrets.REGISTRY }}"
+          IMAGE_NAME="${{ secrets.IMAGE_NAME }}"
+          DOCKER_USERNAME="${{ secrets.DOCKER_USERNAME }}"
+          DOCKER_PASSWORD="${{ secrets.DOCKER_PASSWORD }}"
+
+          if [ -z "$REGISTRY" ] || [ -z "$IMAGE_NAME" ]; then
+            echo "Missing required secrets: REGISTRY and IMAGE_NAME must be set." >&2
+            exit 1
+          fi
+
+          TAG=$(git rev-parse --short HEAD)
+          IMAGE="$REGISTRY/$IMAGE_NAME:$TAG"
+          LATEST="$REGISTRY/$IMAGE_NAME:latest"
+
+          echo "Logging in to $REGISTRY"
+          echo "$DOCKER_PASSWORD" | docker login "$REGISTRY" -u "$DOCKER_USERNAME" --password-stdin
+
+          echo "Building $IMAGE (and tagging as latest)"
+          docker build -t "$IMAGE" -t "$LATEST" .
+
+          echo "Pushing $IMAGE"
+          docker push "$IMAGE"
+
+          echo "Pushing $LATEST"
+          docker push "$LATEST"
+
+        env:
+          # secrets are available via ${{ secrets.<name> }} in Gitea Actions
+          REGISTRY: ${{ secrets.REGISTRY }}
+          IMAGE_NAME: ${{ secrets.IMAGE_NAME }}
+          DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
+          DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}