CI: Add GitHub Actions workflow for building desktop app

This commit introduces a GitHub Actions workflow to automate the build process for the ModernADB desktop application.

The workflow will:
- Trigger on push and pull request events to the `main` and `cicd` branches.
- Build the application on `ubuntu-latest`, `windows-latest`, and `macos-latest` runners.
- Set up JDK 21 and Gradle.
- Execute the `./gradlew packageRelease` command to build the native distribution.
- Upload the resulting binaries as artifacts, named `ModernADB-${{ matrix.os }}`.

Additionally, this commit:
- Adds RPM as a target format in `composeApp/build.gradle.kts`.
- Introduces a new Gradle task `packageAll` that depends on `packageMsi`, `packageDmg`, `packageDeb`, and `packageRpm` to build all native distribution packages.

Author: laetuz

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         # Define the operating systems to build on
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        os: [ubuntu-latest, windows-latest]
     runs-on: ${{ matrix.os }}
 
     steps: