ci: add release workflow for main

.github/workflows/release.yml

@@ -0,0 +1,39 @@
+name: Build and Release
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libgtk-4-dev librsvg2-dev
+
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Build
+        run: cargo build --release
+
+      - name: Generate short SHA
+        id: vars
+        run: echo "sha_short=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+
+      - name: Release
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: release-${{ steps.vars.outputs.sha_short }}
+          name: Build ${{ steps.vars.outputs.sha_short }}
+          files: target/release/icon-color-tool
+          body: |
+            Automated build from commit ${{ github.sha }}.
+            
+            **Note**: This is a dynamically linked binary. It requires GTK4 and librsvg to be installed on the host system to run.