ci: Add Github Actions jobs for release management (#34)

.github/workflows/release-pr.yml

@@ -0,0 +1,38 @@
+name: Open a Rust release PR
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: Version to release
+        required: true
+        type: string
+
+jobs:
+  make-release-pr:
+    permissions:
+      id-token: write
+      pull-requests: write
+      contents: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: chainguard-dev/actions/setup-gitsign@main
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: stable
+
+      - name: Install cargo-release
+        run: |
+          VERSION=$(curl --silent "https://api.github.com/repos/crate-ci/cargo-release/releases/latest" | jq -r .tag_name)
+          wget https://github.com/crate-ci/cargo-release/releases/download/$VERSION/cargo-release-$VERSION-x86_64-unknown-linux-gnu.tar.gz
+          tar -xzvf cargo-release-$VERSION-x86_64-unknown-linux-gnu.tar.gz --wildcards '*cargo-release' --strip-components=1
+          cp cargo-release $HOME/.cargo/bin
+
+      - uses: cargo-bins/release-pr@v2
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          version: ${{ inputs.version }}
+          crate-name: light-poseidon

.github/workflows/release.yml

@@ -0,0 +1,29 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - "*"
+
+permissions:
+  contents: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Run cargo publish
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CRATES_IO_TOKEN }}
+        run: |
+          cargo publish -p light-poseidon --token $CARGO_REGISTRY_TOKEN