Add Gitea CI workflow

.gitea/workflows/ci.yml

@@ -0,0 +1,74 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  backend:
+    name: Backend tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+          cache: pip
+          cache-dependency-path: backend/requirements.txt
+
+      - name: Install backend dependencies
+        working-directory: backend
+        run: |
+          python -m venv .venv
+          . .venv/bin/activate
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+
+      - name: Run backend tests
+        working-directory: backend
+        run: |
+          . .venv/bin/activate
+          pytest
+
+  frontend:
+    name: Frontend build
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+          cache: npm
+          cache-dependency-path: frontend/package-lock.json
+
+      - name: Install frontend dependencies
+        working-directory: frontend
+        run: npm ci
+
+      - name: Build frontend
+        working-directory: frontend
+        run: npm run build
+
+  scripts:
+    name: Script syntax
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Check shell scripts
+        run: bash -n scripts/*.sh

AGENTS.md

@@ -159,6 +159,14 @@ journalctl -u pve-cloud-backup-web.service -u pve-cloud-backup-worker.service --
 
 ## Validation commands
 
+CI workflow:
+
+```text
+.gitea/workflows/ci.yml
+```
+
+The workflow is for Gitea Actions and runs backend tests, frontend build, and shell script syntax checks. It uses setup-action package caching for pip and npm, keyed from `backend/requirements.txt` and `frontend/package-lock.json`.
+
 Backend tests:
 
 ```bash

README.md

@@ -137,6 +137,27 @@ Optional environment variables:
 
 The script creates a disabled backup job and, by default, queues it once. Only run it when you intentionally want a real Proxmox backup and rclone upload.
 
+## CI
+
+Gitea Actions workflow:
+
+```text
+.gitea/workflows/ci.yml
+```
+
+It runs on pushes and pull requests to `main` and can also be started manually. The workflow checks:
+
+- backend dependency install and pytest;
+- frontend dependency install and production build;
+- shell script syntax.
+
+Package caches are enabled through the Gitea Actions cache-compatible setup actions:
+
+- Python/pip cache keyed by `backend/requirements.txt`;
+- npm cache keyed by `frontend/package-lock.json`.
+
+The Gitea runner must have action cache support configured for cache restore/save to work.
+
 ## Updates
 
 After pulling new code, apply it with: