adicionar workflow para deploy staging

.github/workflows/staging.yml

@@ -0,0 +1,35 @@
+name: "Deploy to staging"
+on:
+  push:
+    branches-ignore:
+      - main
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: determinatesystems/nix-installer-action@v4
+    - uses: determinatesystems/magic-nix-cache-action@v2
+    - name: set baseurl
+      run: |
+        sed -i 's/default.nix { }/default.nix { baseurl = "${{ github.ref_name }}"; }'
+        cat flake.nix
+    - name: nix build
+      id: build
+      run: |
+        echo "out-path=$(nix build --print-out-paths)" >> "$GITHUB_OUTPUT"
+
+    - uses: webfactory/[email protected]
+      with:
+        ssh-private-key: ${{ secrets.DEPLOYER_SSH_KEY }}
+    - name: set known hosts
+      run: |
+        cat <<EOF >> ~/.ssh/known_hosts
+        [galapagos.gelos.club]:2112 ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIORz4g+LH7W1XYXqYsSsJMGupEJr23XJOnkHGSyYBQHd
+        [galapagos.gelos.club]:2112 ssh-rsa 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
+        EOF
+    - name: deploy
+      run: |
+        NIX_SSHOPTS="-p 2112" nix copy --to ssh://[email protected] ${{ steps.build.outputs.out-path }}
+        ssh [email protected] -p 2112 \
+          ln -s '${{ steps.build.outputs.out-path }}' '/srv/staging/${{ github.ref_name }}'