Add release GitHub action

.github/workflows/release.yml

@@ -0,0 +1,62 @@
+name: Build a release
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  build:
+    name: Build
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-13, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install Crystal
+        uses: crystal-lang/install-crystal@v1
+      - name: Install dependencies
+        run: shards install --production
+      - name: Inject slug/short variables
+        uses: rlespinasse/github-slug-action@v5
+      - name: Set architecture environment variable
+        run: |
+          if [ "$RUNNER_ARCH" == "X64" ]; then
+            echo "ARCH=x86_64" >> $GITHUB_ENV
+          elif [ "$RUNNER_ARCH" == "ARM64" ]; then
+            echo "ARCH=arm64" >> $GITHUB_ENV
+          else
+            echo "ARCH=unknown" >> $GITHUB_ENV
+          fi
+      - if: matrix.os == 'ubuntu-latest'
+        name: Build binary (Linux)
+        run: |
+          mkdir bin
+          docker run --rm -it -v $(pwd):/workspace -w /workspace \
+            crystallang/crystal:latest-alpine \
+            crystal build --static --release --debug \
+            -o bin/moltiverse-${GITHUB_REF_SLUG}-linux-${ARCH} \
+            src/moltiverse.cr
+      - if: startsWith(matrix.os, 'macos')
+        name: Build binary (macOS)
+        run: |
+          mkdir bin
+          crystal build --release --debug \
+            -o bin/moltiverse-${GITHUB_REF_SLUG}-osx-${ARCH} \
+            src/moltiverse.cr
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: bin-${{ matrix.os }}
+          path: bin
+      - name: Upload to GitHub Releases
+        uses: svenstaro/upload-release-action@v2
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          tag: ${{ github.ref }}
+          overwrite: true
+          file_glob: true
+          file: bin/*