Add release workflow

Author: aciceri

.github/workflows/release.yml

@@ -0,0 +1,50 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build-images:
+    name: Build ${{ matrix.image }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        image:
+          - qcow2
+          - ami
+          - gce
+          - azure
+          - do
+          - linode
+          - oracle
+          - vmware
+          - proxmox
+          - hyperv
+          - lxc
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: cachix/cachix-action@v15
+        with:
+          name: polkanix
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+
+      - name: Build ${{ matrix.image }}
+        run: nix build -L '.#${{ matrix.image }}'
+
+      - name: Compress image
+        run: |
+          cd result
+          tar -czf ../${{ matrix.image }}.tar.gz *
+          cd ..
+
+      - name: Upload to release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: ${{ matrix.image }}.tar.gz
+          tag_name: ${{ github.ref_name }}
+          draft: false
+          prerelease: false