Create workflows for publishing releases (#2)

Author: jwilger

.github/workflows/create-release.yml

@@ -0,0 +1,48 @@
+name: Create Release
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - "Cargo.toml"
+
+jobs:
+  create_release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Extract version from Cargo.toml
+        id: extract_version
+        run: |
+          version=$(grep '^version' Cargo.toml | sed -E 's/version = "(.*)"/\1/')
+          echo "::set-output name=version::$version"
+
+      - name: Check if tag exists
+        id: check_tag
+        run: |
+          version=v${{ steps.extract_version.outputs.version }}
+          if git rev-parse "$version" >/dev/null 2>&1; then
+            echo "Tag $version already exists."
+            exit 0
+          else
+            echo "Tag $version does not exist."
+            echo "::set-output name=tag::$version"
+          fi
+
+      - name: Create Release
+        if: steps.check_tag.outputs.tag
+        uses: actions/create-release@v1
+        with:
+          tag_name: ${{ steps.check_tag.outputs.tag }}
+          release_name: ${{ steps.extract_version.outputs.version }}
+          body: |
+            Changes in this release:
+            ${{ github.event.head_commit.message }}
+          draft: false
+          prerelease: false
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/publish-crate.yml

@@ -0,0 +1,23 @@
+name: Publish Crate
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Set up Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain_file: true
+
+      - name: Publish to crates.io
+        run: cargo publish
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}