feat(build): add release automation tasks and CI/CD workflows

- Introduced Gradle tasks for release preparation, version bumping, and git tagging.
- Added CI workflow for continuous integration on pushes and pull requests.
- Implemented release workflow for automated builds and Gitea releases upon tag pushes.
- Created scripts for manual release processes on Windows and Linux/macOS.
- Documented the release process and Gitea Actions setup in the new RELEASE.md and setup-gitea-actions.md files.

scripts/release.bat

@@ -0,0 +1,77 @@
+@echo off
+REM PlayHours Release Script for Windows
+REM This script automates the release process
+
+echo Starting PlayHours release process...
+
+REM Check if we're in a git repository
+git status >nul 2>&1
+if %errorlevel% neq 0 (
+    echo Error: Not in a git repository
+    exit /b 1
+)
+
+REM Check if there are uncommitted changes
+git diff --quiet
+if %errorlevel% neq 0 (
+    echo Warning: You have uncommitted changes. Please commit them first.
+    echo Do you want to continue anyway? (y/N)
+    set /p choice=
+    if /i not "%choice%"=="y" (
+        echo Release cancelled.
+        exit /b 1
+    )
+)
+
+REM Get current version
+for /f "tokens=2 delims==" %%a in ('findstr "mod_version=" gradle.properties') do set CURRENT_VERSION=%%a
+echo Current version: %CURRENT_VERSION%
+
+REM Ask for new version
+echo Enter new version (current: %CURRENT_VERSION%):
+set /p NEW_VERSION=
+
+if "%NEW_VERSION%"=="" (
+    echo No version entered. Using current version.
+    set NEW_VERSION=%CURRENT_VERSION%
+)
+
+REM Update version in gradle.properties
+powershell -Command "(Get-Content gradle.properties) -replace 'mod_version=%CURRENT_VERSION%', 'mod_version=%NEW_VERSION%' | Set-Content gradle.properties"
+
+REM Build the project
+echo Building project...
+call gradlew clean build
+if %errorlevel% neq 0 (
+    echo Build failed!
+    exit /b 1
+)
+
+REM Create git tag
+echo Creating git tag v%NEW_VERSION%...
+git tag -a v%NEW_VERSION% -m "Release v%NEW_VERSION%"
+if %errorlevel% neq 0 (
+    echo Failed to create tag!
+    exit /b 1
+)
+
+REM Push changes and tags
+echo Pushing changes and tags...
+git push origin main
+git push origin v%NEW_VERSION%
+if %errorlevel% neq 0 (
+    echo Failed to push changes!
+    exit /b 1
+)
+
+echo.
+echo Release v%NEW_VERSION% completed successfully!
+echo.
+echo Next steps:
+echo 1. Go to your Gitea repository
+echo 2. Create a new release with tag v%NEW_VERSION%
+echo 3. Upload the JAR file from build\libs\playhours-%NEW_VERSION%.jar
+echo 4. Add release notes
+echo.
+echo JAR file location: build\libs\playhours-%NEW_VERSION%.jar
+pause