ci: simplify release workflow to read version from Cargo.toml

Signed-off-by: danbugs <danilochiarlone@gmail.com>

Author: danbugs

.github/workflows/release.yml

@@ -2,11 +2,6 @@ name: Create release
 
 on:
   workflow_dispatch:
-    inputs:
-      version:
-        description: 'Release version (e.g., 0.2.0) — without the v prefix'
-        required: true
-        type: string
 
 concurrency:
   group: release
@@ -23,44 +18,31 @@ jobs:
         with:
           ref: main
 
-      - name: Validate version input
+      - name: Read version from Cargo.toml
+        id: version
+        working-directory: host
+        run: |
+          VERSION=$(grep '^version' Cargo.toml | head -1 | sed 's/version = "\(.*\)"/\1/')
+          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
+          echo "Detected version: $VERSION"
+
+      - name: Validate version
         run: |
-          VERSION="${{ github.event.inputs.version }}"
+          VERSION="${{ steps.version.outputs.version }}"
           if [[ ! "$VERSION" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
-            echo "::error::Invalid version '$VERSION' — expected semver like 1.2.3"
+            echo "::error::Invalid version '$VERSION' in Cargo.toml — expected semver like 1.2.3"
             exit 1
           fi
           if git rev-parse "v$VERSION" >/dev/null 2>&1; then
-            echo "::error::Tag v$VERSION already exists"
+            echo "::error::Tag v$VERSION already exists — bump the version in Cargo.toml first"
             exit 1
           fi
 
-      - uses: Swatinem/rust-cache@v2
-        with:
-          workspaces: host -> target
-
-      - name: Bump Cargo.toml version
-        working-directory: host
-        run: |
-          VERSION="${{ github.event.inputs.version }}"
-          sed -i "s/^version = \".*\"/version = \"$VERSION\"/" Cargo.toml
-          cargo generate-lockfile
-          grep "^version" Cargo.toml
-
-      - name: Commit version bump
-        run: |
-          VERSION="${{ github.event.inputs.version }}"
-          git config user.name "github-actions[bot]"
-          git config user.email "github-actions[bot]@users.noreply.github.com"
-          git add host/Cargo.toml host/Cargo.lock
-          git commit -m "release: v$VERSION"
-          git push origin main
-
       - name: Create tag and GitHub Release
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          VERSION="${{ github.event.inputs.version }}"
+          VERSION="${{ steps.version.outputs.version }}"
           git tag "v$VERSION"
           git push origin "v$VERSION"
           gh release create "v$VERSION" \
@@ -71,5 +53,5 @@ jobs:
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          VERSION="${{ github.event.inputs.version }}"
+          VERSION="${{ steps.version.outputs.version }}"
           gh workflow run publish-examples.yml --ref "v$VERSION"