✨ Create draft release on new tag pushed

.github/workflows/release.yml

@@ -0,0 +1,63 @@
+on:
+  push:
+    tags:
+      - "*"
+
+jobs:
+  check-main-branch:
+    runs-on: ubuntu-latest
+    outputs:
+      contains: ${{ steps.check.outputs.contains }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: main
+          fetch-depth: 0
+      - id: check
+        run: |
+          branches=$(git branch --contains "$GITHUB_REF_NAME")
+          for branch in $branches; do
+            if [[ "$branch" == "main" ]]; then
+              echo "contains=true" >> "$GITHUB_OUTPUT"
+              exit 0
+            fi
+          done
+          echo "contains=false" >> "$GITHUB_OUTPUT"
+
+  build-book:
+    runs-on: ubuntu-latest
+    env:
+      # FIXME: duplicate of .github/workflows/main.yml:112
+      MDBOOK_VERSION: v0.4.36
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.ref }}
+      - run: |
+          curl -fsSL "$REPO_URL$RELEASE_DL_PATH/$MDBOOK_VERSION/$FILENAME" | tar xz
+        env:
+          REPO_URL: https://github.com/rust-lang/mdBook
+          RELEASE_DL_PATH: /releases/download
+          FILENAME: mdbook-${{ env.MDBOOK_VERSION }}-x86_64-unknown-linux-gnu.tar.gz
+      - run: |
+          ./mdbook build
+          tar czf book.tar.gz book
+      - uses: actions/upload-artifact@v4
+        with:
+          name: book-archive
+          path: ./book.tar.gz
+
+  create-release:
+    runs-on: ubuntu-latest
+    needs: check-main-branch
+    if: ${{ needs.check-main-branch.outputs.contains == 'true' }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.ref }}
+      - uses: actions/download-artifact@v4
+        with:
+          name: book-archive
+      - run: |
+          gh release create $GITHUB_REF_NAME book.tar.gz \
+            -d -t $GITHUB_REF_NAME -n "" --verify-tag