Auto-update README on release

.github/workflows/update-readme.yml

@@ -0,0 +1,35 @@
+name: Update README version
+
+on:
+  release:
+    types: [published]
+
+permissions:
+  contents: write
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: main
+
+      - name: Update version in README
+        run: |
+          VERSION="${{ github.event.release.tag_name }}"
+          FILE="README.md"
+
+          # Update cargo dependency version (e.g. "0.2" -> "0.3")
+          MAJOR_MINOR="${VERSION#v}"
+          MAJOR_MINOR="${MAJOR_MINOR%.*}"
+          sed -i "s|libfreemkv = \"[0-9]*\.[0-9]*\"|libfreemkv = \"${MAJOR_MINOR}\"|" "$FILE"
+
+      - name: Commit and push
+        run: |
+          VERSION="${{ github.event.release.tag_name }}"
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add README.md
+          git diff --cached --quiet || git commit -m "Update to libfreemkv ${VERSION}"
+          git push