ci: add release workflow

.github/workflows/release.yml

@@ -0,0 +1,30 @@
+name: Create release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  build-and-release:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup cmake
+        uses: jwlawson/actions-setup-cmake@v2
+
+      - name: Build package
+        run: |
+          cmake -B build -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/ -DVERSION=$GITHUB_REF_NAME
+          cmake --build build --target package
+
+      - name: Create release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: build/packages/caelestia-shell-${{ github.ref_name }}.*
+          generate_release_notes: true